After a Foot of Rain, the Green Comes Fast

Normally, early February is already notably green. In a typical year, we'd get our first rain in November sometime, with more every week or two through December and January. By this time, you'd expect it to look something like this photo below, taken in early February of 2019:

Not so much, this year. You can see in the photos that I shared in my blog recapping last week's storm that it was almost entirely brown still in the vineyard. The roughly inch and a half of rain we'd received wasn't enough to germinate either the native seeds or the cover crop we'd planted. But with over a foot of rain last Tuesday through Friday, and mostly sunny weather since, the vineyard's transformation from brown to green is happening fast. Here are a few photos that will give you a sense. First, a shot looking up down and back up between two rows of Grenache Blanc toward the western part of the vineyard:

A little further west, in a head-trained Grenache block, a similar carpet is appearing:

On a steeper part of the same vineyard block, you can see how we pull the Yeoman's Plow across the slope to slow the flow of water downhill and encourage absorption rather than surface flow:

A longer view of that same block shows the new green growth even more clearly:   

Despite our late start, I'm not worried that we'll miss out on a significant amount of the organic matter that the cover crops create. Even in a normal year, December and January aren't great months for cover crop growth, with their regularly below-freezing nights and short days. It's not until late February, as the days get longer and warmer, that the cover crop really gets going. But from here on out, I expect the view to change by the day. Annual plants in California are always in a hurry to take advantage of the rainy season to build root and leaf systems, create carbohydrates, and then go to seed, all before the summer's heat and dry conditions take over. The rain may have come a couple of months late, but the cover crops are going to look like they're trying to make up for lost time. And views like this last one, looking at the setting sun through our olive trees, are only going to get greener by the day.

I look forward to sharing the ongoing transformation with you.

Assessing the Historic January 2021 Winter Storm on California's Central Coast

I sit here in my office at the vineyard, looking at a sunny landscape outside, listening to birdsong coming in through my open window. It could be a California Chamber of Commerce commercial. What a change from the last 72 hours, during which we saw the largest storm in our 31-year history drop 12.71" of rain on us. For perspective, that's almost half of what we expect to receive in a normal year (26") and 828% of the total that we'd received so far since fall. Since we installed our weather station in 1996, we've had just five months that exceeded the rain we received in this storm.

Before I dive into how the rain came down, what things look like now, and what we think its long-term impacts will be, let me set the stage. I wasn't out here the past two days, but Senior Assistant Winemaker Chelsea Franchi took a break from overseeing a bottling run we couldn't reschedule to capture this great photo of our flock sheltering under our solar panels during the height of the storm Wednesday:

The rain started Tuesday around 8pm, with four-hundredths of an inch that hour. Both rain and wind built in intensity, with our strongest gust (40.8mph) coming at 4am Wednesday. That hour was also the first hour where we got over a quarter-inch of rain. We would exceed that total for the next 22 hours, ending 2am Thursday. By that point we had accumulated 9.42" of rain, nearly double the 5.36" that we would expect in an average January. At that point the rain slowed down, but we had measurable rainfall every hour for another 20 hours, ending at 10pm Thursday evening and picking up another 3.02". And while the bulk of the storm had moved past us, we did get some more showers early Friday morning, accumulating an extra 0.27" in total. The final tally of 12.71" is the most we've ever seen from one storm, eclipsing the 9.6" we received in one storm in October of 2009. 

What drove this storm? A meteorological phenomenon called an atmospheric river, where a relatively narrow plume of moisture stretches from southwest to northeast across the Pacific, funneling tropical moisture toward the California coast. This is different than a typical storm, which is centered around a low pressure system and rotates counter-clockwise. While those storms can bring intense rainfall, they don't generally pummel the same spot for hours on end. Atmospheric rivers are a critical part of California's water systems, and even moderate atmospheric rivers can produce significant coastal rainfall and Sierra Nevada snow. Powerful atmospheric rivers can bring staggering amounts of precipitation, refilling reservoirs and aquifers but also causing flooding and mudslides. A satellite photo shared by the Western Weather Group, which provides forecasts for the Paso Robles Wine Country Alliance, shows the storm system clearly:

Remarkably, this picture could have been taken any time Wednesday or Thursday, as the plume of moisture barely moved for two days. The Adelaida area where we are was the center of the storm's bullseye, accumulating triple or quadruple the already-significant totals that most of the rest of the AVA saw. And that water adds up. Our area drains into Lake Nacimiento, and the storm raised the lake's level by 24 feet since Tuesday, and its capacity from 21% to 39%. That may not sound like much, but it's a massive lake whose surface area grew by 1,000 acres since Tuesday, adding more than 21 billion gallons to its volume. 

I got out into the vineyard today, and found that it held up better than I'd feared it would to this onslaught of rain. As you would expect given that it had been so dry that our cover crops weren't well established yet, there was some surface erosion in some of our blocks, like this Cinsaut planting:

 Or at the edge of this old block containing Counoise and Mourvedre:

The roads, which are less porous than the vineyards, are always at greater risk of erosion. That's true both in the case of unimproved roads, like this one running down from our old nursery buildings toward Last Tablas Creek:

And even on the vineyard roads where we laid straw to slow the flow of water and limit erosion the many hours of flowing water were enough to overwhelm our preparations:

The calcareous soils that underlie Tablas Creek are so absorbent that the vast majority of the water soaked in. I only found one vineyard block that had any standing water in it: a head-trained Grenache block near the north end of the property:

But most of the vineyard looked like it was in great shape. This old Grenache block is representative:

The water that did run off ended up in Las Tablas Creek, eventually flowing into Lake Nacimiento. Today, the creek was hardly a raging torrent:

That relatively gentle flow, even on the last day of a historic storm, should tell you one more thing in addition to providing evidence of how absorbent our soils are. This winter, up until now, has been exceptionally dry. Normally, by the end of January we'd expect to have received about 13.5" of rain. Before this storm hit, our winter total sat at a paltry 1.37". Thanks to our recent atmospheric river, we've recovered from about 10% of normal rainfall to about 105% of normal rainfall. But even with this storm, what we've seen is only about average for a winter at this point.

What's next? Hopefully, a few days of sun to transfer the water from saturated surface soils to deeper layers, and to give the cover crop a chance to get growing. We have gotten a little growth, but it's variable and nowhere particularly well established. This section, which we left fallow this year in preparation for a new Mourvedre planting this spring, is probably the farthest along:

But before too much longer, we'd like some more rain. It looks like there's a little in the forecast for next week. A moderate storm of a couple of inches every 10 days or so would be just about perfect. If you've got sway with any weather gods, please let them know.

Meanwhile, we'll be grateful that we've made up three months of rainfall deficit in three days. We'll be looking forward to the vineyard being noticeably greener in under a week. And we'll be listening to the splash and burble of Las Tablas Creek flowing after 10 dry months. It may not be rushing torrent, but it's a more than healthy start.

A picture is worth 1000 words, late fall edition

With our tasting room closed again due to our Regional Stay Home Order, we've decided that it's more important than ever to share lots of photos to make sure that people can maintain a sense of what it's like out here. To that end, I was out yesterday walking around the vineyard to get some photos to share, and found it inescapable how dry it was. Often, by early December, we've gotten a couple of nice rainstorms, and the vineyard is already notably green. Not in 2020. It's been cold, which is good, because it forces the grapevines into dormancy, but we've only gotten a couple of small rainstorms, and nothing recently. I couldn't help but feel the stress of the grapevines I passed.

And yet, the annual cycle continues. I got one photo of a head-trained Mourvedre vine, roughly a decade old, that I thought was illustrative:

Consider, if you will, the stresses that this and all our other vines have endured this year and endure, more or less, each year:

• An almost total lack of topsoil. Our deepest topsoils are a couple of feet thick, and much of the property has the fractured calcareous shale you see right at the surface. 
• Minimal rain for six months every summer and fall. Our total rainfall in the last 8 months is 0.8"⁠. That's a little extreme, but the average total May-October rainfall here at Tablas Creek over the last 25 years is just over two inches. Yes, our winters are wet. And yes, our soils do an amazing job retaining that winter rain. But this is a lot more extreme than anything grapevines have to deal with even in the driest parts of Europe.
• Regular frosts in the winter. In the last month, it's dropped below freezing ten nights. That's not unusual; we average about 40 frost nights a year here, and though we've been lucky in recent years, spring freezes are the most significant annual weather threat we face. That too is more than Mediterranean regions like Chateauneuf-du-Pape face.
• Scorching summers. This summer, we had 21 days top 100. That was unusual; I wrote earlier this year how 2020 was the year where climate change felt real. But we average roughly a dozen 100+ days each year. And while the Mediterranean can get very hot, 90s are a lot more common than 100s there.

That Mourvedre vine has never had a drop of irrigation. There's not even any irrigation infrastructure in that block. And yet, each year it sprouts, flowers, ripens a crop, and stores what it needs for the next year. And out of this struggle comes grapes (and wines) of intensity and character. Deep roots that reflect the calcareous soils we love. Resilience and longevity.

It's not an easy life, but we wouldn't have it any other way.

Tracking the Changing of the Seasons: November Brings Transformation

There are long stretches of the year when the look of the vineyard doesn't change much. Can you tell August from May? Not easily. Some of the grapes will have changed colors. The leaves of the vines might not be quite as vibrant a green. How about March from January? Maybe in the length of the cover crop, unless our sheep have been through. Maybe in the quality of the sun. But it's subtle. Not November. That's a month of rapid, visible transformation, as we get our first frosts, the vine leaves go from green to brown to missing, and (hopefully) we see the first shoots of green, with the arrival of our winter rains.

I took a long walk around the vineyard yesterday to gather material for my Wednesday Instagram Live broadcast, and was struck by how different things looked after three nights of lows in the 20s than they did just a week ago. Check out this side-by-side, from between the same rows of Syrah. The photo on the left was from a week ago, and the photo on the right from yesterday:

Before you start worrying, this is totally normal, and healthy. Frost is a signal to the grapevines that they don't need to expend any further energy maintaining leaves and ripening fruit, and instead should store carbohydrates in their root systems for the next year. Years where we don't get a hard freeze before it starts raining can be a problem, as vines expend energy that they should be conserving for the next spring in new growth that will just get frozen later.

Although we got a little rain last weekend, the two-tenths of an inch didn't have any impact that I could see other than having cleaned off our solar panels. But with more rain forecast for next week, it was a good reminder that we needed to get the vineyard put to bed. One of the pieces of this effort involves laying out straw on the hillside roads (which are less porous than the vineyard, and therefore erosion risks) so they don't become seasonal creekbeds:

We're also getting ready for the winter's planting. It's going to be a big year for us, with some 15 acres scheduled to go into the ground. One of the blocks we're most excited to get replanted is the block below, which was the site of our original Mourvedre vines, planted from American-sourced cuttings in 1992. It's a terrific site, just below the top of our tallest hill, but the clones themselves were weak, and even grafting French cuttings onto them some 15 years ago didn't produce wine of the quality of our other top blocks. So, two years ago we pulled it out, and have left it fallow until it will get new, high quality Mourvedre plants this winter. It's not even quite two acres, but we have high hopes for it:

Maybe the most exciting development each November is the beginning of lambing season. We try to time it so that they're born just before the cover crop sprouts, so that when they're growing the food is at its most plentiful. We're still supplementing with the fodder we harvested and baled last winter, but hopefully not for much longer. I hope you're ready for lots of baby lamb pictures over the next few months.

I'll leave you with my favorite photo that I took yesterday, looking down through our oldest Grenache block, over Counoise (to the right of the row of olive trees) and Tannat (on the valley floor), and to Roussanne and eventually Muscardin on the far hillside. The color palette is unique to November, with golds and browns and oranges, not much green to be found, the overcast sky we only see in winter, but subtle and beautiful in its own right. Bring on winter.

Harvest 2020 Recap: Fast and Furious, a Reflection of Our Warmest Harvest Season Ever

On Friday, with the bin of Tannat pictured below, we completed the 2020 harvest. This capped a 45-day sprint: among our shorter harvests and earliest finishes in our history. What produced this sustained sprint? Our warmest-ever harvest season, with really no breaks in the heat, except for a couple of days where the atmospheric smoke was so thick that the sun never came out and the days topped out in the low 70s. That wasn't pleasant. But for all the unusual conditions and unrelenting pace, we're still happy with the quality of what's in the cellar. And that, in 2020, is reason to celebrate:

Many years, you expect to see a bell curve-shaped harvest graph. Not 2020. After a fairly gentle first two weeks, we brought in between 60 and 75 tons off the estate each week for five weeks, and then were done. The chart below shows the box-shaped curve (in the chart, blue is purchased fruit for the Patelin program, and orange estate-grown fruit):

Yields were solid, up about 7% from 2019, but still in that 3-3.5 tons per acre that we see in many of our favorite vintages. This is somewhat of a surprise. We were expecting yields at or below last year even before the record heat waves impacted yields on sensitive grapes like Mourvedre and Roussanne. And those two grapes did suffer a bit. But other grapes, particularly the Grenaches, made up the difference. The complete picture:

Grape	2020 Yields (tons)	2019 Yields (tons)	% Change vs. 2019
Viognier	18.8	17.4	+8.0%
Marsanne	13.0	12.3	+5.7%
Grenache Blanc	46.7	28.3	+65.0%
Picpoul Blanc	8.7	8.6	+1.2%
Vermentino	21.1	24.7	-14.6%
Roussanne	34.8	46.1	-24.5%
Other whites	7.9	7.8	+1.3%
Total Whites	151.0	145.2	+4.0%
Grenache	74.9	51.4	+45.7%
Syrah	43.8	42.5	+3.1%
Mourvedre	46.9	49.6	-5.4%
Tannat	17.6	19.0	-7.4%
Counoise	15.9	20.0	-20.5%
Other reds	7.2	5.6	+28.6%
Total Reds	206.3	188.1	+9.7%
Total	357.3	333.3	+7.2%

Average yields ended up at 3.35 tons per acre, just slightly above our ten-year average, and almost exactly our average if you exclude the frost years of 2009 and 2011. Other years between 3 and 3.5 tons per acre include 2008, 2018, and 2019, all among our favorite years. It's perhaps unsurprising that our later-ripening grapes (like Mourvedre, Roussanne, Tannat, and Counoise) were the ones that were down (by just under 15%, on average) since the vines were starting to wear down under the relentless heat and dry conditions. Why we weren't down overall can be credited to Grenache, and that was up not because of the conditions in 2020, but because in 2019 both Grenache Noir and Grenache Blanc suffered reduced yields due to shatter (incomplete fertilization of berries caused by cool weather or wind during flowering).

I am concerned that this is two years in a row of very low Mourvedre production. Both years came in under two tons per acre. Some of that is variety-specific (we know it's not a high-yielding grape like Grenache or even Syrah) but it came in at 2.6 tons/acre as recently as 2017, and in the mid-2000's averaged around 3.0 tons/acre. We know we have some missing vines in some of our older Mourvedre blocks, and we'll be replanting a Mourvedre block we pulled out a couple of years ago. Hopefully, between some additional focus on vine health and these new blocks, we'll be able to get our Mourvedre production back up. For this year, I'm expecting it to constrain the amount of Esprit de Tablas and varietal Mourvedre we can make.

We had 118 harvest lots, an increase of 23 over 2019. Most of that is multiple picks that we made with our late-ripening blocks (identified with Roman numerals in the chalkboard below) but it's also exciting to see our first-ever harvest of Muscardin:

That Muscardin, 130 pounds in total, is currently sitting in our smallest stainless steel microfermenter. We're hoping for maybe 10 gallons of wine, enough to taste and evaluate. Stay tuned!

Another way that you can get a quick assessment of concentration is to look at average sugars and acids. Since 2007, the average degrees Brix and pH:

Year	Avg. Sugars	Avg. pH
2007	24.42	3.67
2008	23.87	3.64
2009	23.42	3.69
2010	22.68	3.51
2011	22.39	3.50
2012	22.83	3.65
2013	22.90	3.63
2014	23.18	3.59
2015	22.60	3.59
2016	22.04	3.71
2017	22.87	3.74
2018	22.80	3.62
2019	22.30	3.62
2020	22.14	3.62

You'll note that 2020's numbers are very similar to last year's, and in fact our average harvest pH has been steady for three years. Given how much we love the 2019's, that's a good thing. It also suggests that, as much as we know that the late-ripening grapes did suffer in the heat, our multiple picks allowed us to get the riper clusters off the healthier vines early enough to maintain solid acids.

In terms of weather, I feel like I invited disaster when in late July I commented that 2020's conditions had been, so far, benign. And almost from that moment, it got hot. Some of those days had noteworthy, record-breaking heat. But even the days that weren't noteworthy were mostly warmer than normal. Between August 10th and October 9th (our last day of harvest), we saw just 15 days cooler than seasonal averages, vs. 46 days above, often significantly so. You can see the two stretches that broke records in mid-August and early September, but it's worth also noting the third spike in late September and early October, with daytime highs some 15+ degrees above normal. 

Looking at that information another way, our August degree day totals were 25% above the average of what is already our a very hot month. September was 21% above average. And the first 9 days of October (we finished picking October 9th) were 55% above our 20-year averages. No wonder harvest was short! The chart below shows our degree days by month, including the warmer-than-normal May and June, the cooler-than-normal July, and then the scorching August-October periods. Note that October's information is for the first 9 days, as we picked our last block on October 9th:

I mentioned in my introduction that the duration of harvest -- 45 days -- was on the short side for us. But it's in keeping with what we've observed with all our vintage markers since August, that the durations were compressed by the heat. That includes the duration between veraison and harvest, and between first harvest and last harvest. But individual grapes often stretched across the harvest, as we went through in multiple passes to get what was ripe off the vines while it still had good acidity, knowing we would come back a second or third time if necessary. So, the sequencing we often talk about, with harvest beginning with grapes like Syrah, Vermentino, and Viognier, moving to mid-ripening grapes like Marsanne, Grenache Blanc, and Grenache, and finishing with late grapes like Roussanne, Counoise, Picpoul, and Mourvedre is more complex in 2020. Here's the spread in harvest dates for our principal grapes. We picked four different grapes on our last harvest day (October 9th). The first pick of those grapes were September 4th, September 15th, September 23rd, and September 29th!

• Viognier: August 25-September 12
• Counoise: September 4-October 9
• Vermentino: September 9-11
• Syrah: September 9-October 8
• Marsanne: September 10-11
• Grenache Blanc: September 14-28
• Grenache Noir: September 15-October 9
• Roussanne: September 16-October 8
• Mourvedre: September 23-October 9
• Tannat: September 29-October 9
• Picpoul: October 2-7

In character, it's early to tell what things will be like, but I asked Winemaker Neil Collins to sum up the vintage based on what he's seen so far, and he was unusually enthusiastic, commenting that all the lots showed lots of character, better acids than he'd been expecting, and savory, spicy personalities. We've been tasting lots to try to find any that might have even a hint of smoke taint from the California wildfires earlier in the season, but haven't found even one. That's a relief. As for the vintage's personality, we'll know more in coming weeks.

Of course, just because we've finished picking doesn't mean that we're done with our cellar work. There are still plenty of lots to be pressed off, tanks to be dug out, and fermentations to monitor. But it feels different than it does earlier in harvest, when you're emptying tanks to make room for the next pick. Now, when we press something off and clean a tank out, that's the last time of the season. We've already put a couple of our open-top fermenters outside, where they'll winter over without taking up space. And everything smells amazing, the rich aroma of young red wines spreading throughout the cellar with every press load: 

Now that the fruit is in, it's welcome to start raining any time. There was a chance of some rain this past weekend, though as often happens with early-season systems, it petered out without providing any precipitation here. And, there's nothing wet in the long-term forecast. But that gives us time to put the vineyard to bed, get the animals out into the vineyard to eat any second crop clusters before they rot, spread their manure and jump start the winter soil microbial activity. It also means that we don't have to worry about grapes on the vine being impacted by any other extreme weather that we might see. It is 2020, after all.

And yet, despite all the challenges, in this craziest year that any of us have experienced, we're feeling cautiously optimistic that the 2020 wines might provide something we want to remember.

2020: The Year Climate Change Got Real for American Wine

As I write this, I'm staring out at a dim, yellow landscape, the indistinct sunlight filtered through a thick layer of atmospheric smoke. I have a sweatshirt on because the day has never really warmed up here in town. We had a couple of days this past week, prime ripening season in Paso Robles, where it barely made it out of the sixties. A photo, no filter applied:

We're not really complaining; as apocalyptic as it looks, the air has been cool and fresh at the surface, and we got a chance to catch up on harvesting after what was a scorching hot previous weekend. And plenty is ready. Pretty much all our Syrah. The Vermentino and Marsanne. Our first lots of Grenache Blanc. The smoke has reduced actual temperatures from model forecasts by some 20 degrees, and if we'd had the mid-90s weather that was forecast for this week, it's possible that new blocks would have ripened before we could get through the backlog that the last heat wave produced.

This smoke layer, driven by the fact that six of California ten largest fires ever are currently burning, is only the most recent of a series of unprecedented things we've seen in the 2020 growing season. A week ago, we had a heat wave that crested with back-to-back-to-back days that topped out at 109, 113, and 111. The Paso Robles Airport broke its all-time high with a 117 reading. And San Luis Obispo hit 120°F, which appears to be the highest temperature ever recorded in a coastal zone anywhere in North or South America.

Last month, we saw a trio of fires in the Central Coast produce so much smoke at the surface that we closed our tasting patio for four days because the air quality was so bad. On August 20th, San Luis Obispo had the worst air quality in the world. Those fires were sparked by a surge of tropical moisture, the remnants of Tropical Storm Fausto, that moved up the California coast and produced thousands of lighting strikes on August 14th and 15th. The fires lit by those lightning strikes were fueled by another heat wave that pushed temperatures over 105°F each day between August 15th and 18th.

Paso Robles is hot in the summer. Summer days over 100°F have never been rare here. But the increased number and distribution of these days, the fact that records are falling more often, the earlier and earlier beginnings to harvest (and the shorter durations between veraison and harvest), and finally the new, tropical-influenced rainfall patterns, are new. A few data points that I look at:

• Over our first 15 vintages, 1997-2011, we started our estate harvest in August 40% of the years. Since 2012, we have done so 78% of vintages. Similarly, in those first 15 years, there were six times we harvested into November, and another four that finished October 28th or later. Over the last 8 years, we haven't once harvested in November.
• It's not just harvest. This year's gap between veraison and harvest was just 35 days, breaking our record of 36, set in both 2016 and 2019. Before that, the record was 39, in 2015. 2013 was the first year that we saw 40 or fewer days between veraison and harvest. So, in less than a decade, we've seen this critical ripening period shrink by 15%. Crucial growing periods are getting hotter. 
• Our total growing season degree days, a rough measurement of the number of hours in which it's warm enough for grapevines to photosynthesize efficiently, shows that since 2000, our five warmest years have all come since 2012.

All those data points are indicative, but none of them are likely to on their own pose much of a threat to winemaking here in Paso Robles. But they feed into two phenomena that do: droughts and fires. I'll address droughts first. I wrote a 3-part blog series back in 2014 about our move toward dry farming as a part of being ready for what seems likely to be a drier future. In the research for that, I looked at EPA projections for rainfall showed that, depending on our success in reducing emissions, coastal California would see between 20% and 35% less precipitation annually by the end of the 21st Century:

That research has since been reinforced by studies of warming in the Pacific Ocean, which will have a complex series of consequences, including increased rainfall in places like northern Australia, the Amazon, and Southeast Asia, but less rainfall (and a later onset of the rainy season) in coastal California. This suggests that droughts, particularly the multi-year droughts like the one we saw between 2012 and 2016, will become more common.

Next, fires. It's not like California is a stranger to fires, but severe ones are definitely happening more often. I moved out here in 2002. The first time after that there was any smoke here was July 2008, when I wrote in a blog that two big fires to our north had burned some 73,000 acres in three weeks. (Note that that figure seems almost quaint now, with the horrific Creek Fire east of Fresno burning 160,000 acres in the first four days.) The second fire I noted in the blog was in 2016. Except for 2019, we've seen scary fires in California's wine country each year since then, and 2020 has already seen the most acres burned on record:

Just smashing records of all kind

Right on the heels of overtaking the record 1.9M acres burned in 2018, look at the cumulative #wildfire radiative power in 2020 with at least two months until we see any rain

source: @NOAA #CAfire #CreekFire pic.twitter.com/edBM8WZpTf

— Dave Marvin (@dmarvs) September 8, 2020

The fires are driven by a number of factors, including higher temperatures, lower humidities, poor utility maintenance, human encroachment into wildland areas, and accumulated fuel in the forests after a century of fire suppression. All of these encourage fires to be bigger, faster-growing, and more destructive than before. But what has set the worst ones off in recent years has been climate-related: either through dry winds spurring (and spreading) fires through downed power lines in periods before it has rained in California, or by tropical moisture that has sparked summer lightning.

The fires that impacted Northern California in 2017 and 2018 were produced by late-season (October and November) windstorms that spurred fires from an aging electrical grid. This is largely a governmental and regulatory failure. But while these windstorms aren't new, and don't particularly appear to be a function of climate change, thanks to climate change the time of year when these storms are common is more likely to still be summer-dry. That is why the climate change-driven later onset to the rainy season is a significant contributor to the number and severity of fires.

2020's fires in California have been different. The storms this summer that produced the first series of wildfires were driven by tropical moisture that was pulled into California. A warming climate produces more and larger tropical storms and hurricanes. 2020 has already seen so many tropical storms that I've begun to read articles about how NOAA might run out of names. The direct impacts of tropical storms and hurricanes on California are rare, and minor compared to their impacts in the Atlantic or the Gulf of Mexico. But the more of these storms that form, the greater the chance that tropical moisture can end up in unexpected places. These occasionally produce enough moisture to provide some short-term fire risk reduction (such as the July 2015 storm that dropped more than two inches of rain on us) but more often produce extensive lightning with only limited moisture. These sorts of storms introduce extreme fire risk. 

The combination of warmer days, dryer (and later-beginning) winters, and more frequent incursions of summer tropical moisture has combined to produce drastically more days with very high fire risk.

Our new work on #ClimateChange & autumn wildfire risk in California, led by Michael Goss, is out today in (open-access) ERL. We find that climate change has already doubled the frequency of extreme fire weather days since 1980s.(1/6) #CAwx #CAfire #CAwater https://t.co/kei6rJSZQO pic.twitter.com/W8Y7xn0tkn

— Daniel Swain (@Weather_West) March 30, 2020

So, what to do? That's the hard part. Most of the response has to come at the governmental level. Investments need to be made to modernize utilities. Forest management practices could be improved to reduce the amount of fuel that builds up. Cities, counties, and states should adopt growth plans that reduce the human/wildland interface as much as possible, both to reduce the opportunities for fires to start and to minimize the loss of life and property when they do. But ultimately, if climate change itself goes unaddressed, all these initiatives (none of which are easy or likely to come without resistance) are likely to be overwhelmed by the growth in the number of extreme fire days and fast spread of fires that do start.

Here's where regenerative agriculture comes in. One of its tenets is that agriculture has an important and necessary role in the reduction of greenhouse gases (and especially Carbon Dioxide) in the atmosphere. And plants, after all, are the best engines we have in doing so, since photosynthesis uses CO2 as one of its inputs, turning that carbon into carbohydrates. But modern farming produces more emissions than the plants it grows consume. Some of that is the fertilizer, derived mostly from petrochemicals. Some of that is the fuel for the tractors and other machinery. And some of it is the processing of the agricultural products.

Regenerative agriculture leads the way toward building carbon content in the soil, through a combination of permaculture, cover crops, reduction in tillage, and the replacement of chemical inputs with natural ones like compost or manure. Soils with more carbon content also hold more moisture, which will help California wineries weather the droughts too. We showed in the application process for our new Regenerative Organic Certification that it was possible to increase our soil's carbon content while growing grapes even in a dry climate like Paso Robles.

Regenerative farming is not just for wineries. It's what all farms, from row crops to orchards to fibers to livestock, should be moving toward. But vineyards offer some of the lowest-hanging opportunities for better farming, because wine is a value-added product with the resources to invest, and the investments tend also to make higher-quality grapes and longer-lived vines, providing return on the investments.

I can't imagine how California, Oregon, or Washington wineries can live through the 2020 vintage without worrying about how climate change might impact their future. A small silver lining could be encouraging more of that community to move toward regenerative farming. Consumers have a role to play here too. Before this year, there wasn't an available standard for moving to, measuring, and being audited for being regenerative. Now, with the launch of Regenerative Organic Certification, there is. If your favorite wineries are not farming regeneratively, you should be asking them why not. It's one of the tools we as farmers have to take some control over what is likely to be an increasingly volatile and dangerous future that might look like last week a lot more often than any of us would want. 

Harvest 2020 Begins Slowly, After a Record-Short Interval from Veraison

Last week, we brought in our first two lots of Viognier and our first lot of Syrah. It wasn't a furious start to harvest, but it was still a beginning. The cellar smells like honeysuckle and nectarines from the Viognier, there's the energy that always comes from the beginning of the harvest season, and the harvest chalkboard is no longer a literal clean slate:

[Editor's note, congratulations to Senior Assistant Winemaker Chelsea Franchi and her husband Trevor on the arrival of their little girl Bohdi on our second day of harvest!!!]

We typically mark the beginning of harvest as the day the first fruit comes off the estate. So, in 2020 that meant the August 25th arrival of grapes from our oldest Viognier block. In my verasion post last month, I predicted a start time sometime between August 26th and September 5th. These dates are calculated by adding 36 to 48 days from our veraison date (the range we've seen over the last 15 years between first veraison and first harvest). 2020 produced an interval of just 35 days. If you've been following weather reports from California, you can probably guess why. After a moderate summer that had produced just three 100 degree days as of late July, the last month has seen ten days top the century mark and another ten top 90. Nighttime temperatures were warm too. In late July we hadn't had a single day all summer not drop into at least the 50s. Between August 15th and August 24th, we had nine of the ten nights get down only into the 60s.

Happily, the heat wave broke just as harvest was approaching, and since August 22nd we've seen an average high of 90 (with nothing higher than 95) and an average low of 55. The wildfire smoke we saw between August 19th and 22nd has cleared. And the picks we've done so far have been in ideal conditions. I love the photos that Viticulturist Jordan Lonborg took during that night pick, beginning 3am on August 25th. Here are two; you can see the rest on our Instagram feed:

Although we've started harvesting, it's important to remember that most of the vineyard is still some time off. The family of Rhone grapes is diverse enough that we typically figure a two-month stretch for harvest. In fact, there are some grapes that are still only in the middle of veraison (like this Counoise, below) as others are being picked:

Looking through our other red grapes shows the range of ripeness levels. Counoise is farthest out, likely six weeks or more, but others still have a ways to go. This Mourvedre is mostly red, but still likely won't be picked for more than a month:

Grenache is still as much pink as red, with the range of colors and jewel tones characteristic of this, our most beautiful grape. It too is at least a month out.

There are grapes that are getting close, most notably Syrah, already dark and starting to soften, and showing its classic conical cluster shape:

The other grape that is getting fairly close is Cinsaut. We're only on our second harvest, but one of the reasons why it is more planted than Counoise in France (despite that Counoise is more intense, and they serve similar roles in most blends) is that it ripens a month earlier, before or with Grenache instead of after:

Finally, Terret Noir, which looks fairly dark at this point but is still quite acidic, and on which we will wait another month or so:

On the white side, Viognier is obviously first in line. But there are others like Vermentino, Marsanne, and Grenache Blanc (pictured below) that are getting close. Vermentino might come as soon as the end of this week, and the other two should arrive sometime in the first half of September.

The weather is supposed to warm up again as we get to the end of this week, but seems unlikely to reach the heights of two weeks ago. That's fine. We're ready. Meanwhile, we'll enjoy the new sights and smells of the cellar as fermentations get going. This lone upright tank (filled with our first Syrah, picked Friday) will soon have plenty of new company.

Wineries -- and visitors -- should expect months of recurring periodic closures to tasting rooms

Yesterday, our tasting room was open all day for the first time since Thursday, August 13th. We're open again today, and conditions are lovely. Tomorrow looks pretty safe. After that, well, we'll have to see. At least the heat wave that forced us to close most of last week has moved on, but there are still big fires burning to our north, and whether we'll be able to open will depend on where that smoke goes. 

Welcome to 2020. Anyone waiting for things to go back to normal may be waiting quite a while. And I'm just not sure that wine lovers -- or wineries -- have fully realized that this uncertainty is likely to be the norm, rather than the exception, for tasting room operations over the next six months and more. For our part, I'm fully expecting that we'll have to be closed at least one day a week, on average, over the next six months. Why?

First, and most importantly, COVID, which has meant that wineries in California are restricted to outdoor service only. I agree that this is by far the safest way to open. In fact, even when we could have reopened indoors we restricted ourselves to outdoor service only, because the evidence is strong that the risk of COVID transmission is very low in distanced, outdoor settings, and higher in indoor spaces, even with distancing in place. Of course, being outside means you're at the mercy of the weather. But the virus itself is a source of uncertainty; we’ve already had a few instances locally of positive COVID cases at wineries, who have had to close for stretches to make sure their team and their spaces were safe.

It's not bad, most of the time, being outside in California. It's a big reason why people live here. And we got lucky that we had a moderate summer up until the last few weeks. But the climate that allows wine grapes to ripen is sunny and often hot. We do have some control; we installed extra shade, fans, and misters, and have found that with these measures we're able to lower the temperature roughly ten degrees. Plus, we're typically a little cooler than downtown or areas further east. And we do usually get a late afternoon breeze. But still, if it’s over 100, it’s not safe for our team or pleasant for guests. So, we close early and get people on their way before the heat of the day becomes blazing. We've had to do so eight days so far in August, including a six-day stretch between August 14th and 19th. Our average in Paso is a dozen 100+ days each summer. So expect at least a few more heat-related closures before fall.

The heat wave broke late last week. Unfortunately, we’ve got big fires throughout California, producing copious smoke. A few days ago we had the worst air quality in the world. At least with the heat, we could be open in the mornings. We typically took our last appointments at noon each day. That’s a little less than half our capacity, but it’s a lot better than nothing. But with air conditions unsafe, we couldn’t open at all August 20th, 21st, and 22nd. This dramatic satellite image shows the smoke blanketing much of California late last week:

Stunning view from space of the intense wildfires burning across Northern California covering the region in a sea of smoke. #LNULightningComplex #CZULightningComplex #SCULightningComplex #CAwx #CAfire pic.twitter.com/pr8NRRDSJw

— US StormWatch (@GreatWinter2017) August 21, 2020

The primary culprit for our smoke is the River Fire in Monterey County to our north, which has burned some 48,000 acres since it was started by a cluster of lightning strikes a week ago. But there are fires burning all over California right now, with other big ones in Sonoma, Napa, and Santa Cruz. And I think there’s every reason to expect these to be burning for months.

Typically, wildfires in California’s forests burn until they are put out by the onset of the rainy season in early winter. Our state’s remarkable firefighters are mostly tasked with protecting structures and making sure that the fires aren’t endangering communities. Once a big fire gets going, with the accumulated fuel from California’s winter growth and exceptionally low summer humidity, it’s just too much to ask to put a fire out. And that’s true even when there are only a few fires burning. With dozens of big ones spreading resources thin, there’s no chance.

These fires were mostly started by lightning strikes from a rare summer thunderstorm week-before-last. We seem to have dodged the potential for more dry lightning overnight. But we’ve still got months before winter rains will end our fire season. Remember all those terrible California wine country fires in 2017 and 2018? Those were in October and November. It's still August. We've got a very long way to go.

Until then? We’re expecting to make day-by-day calls, informed by the local air quality, as to whether we can open for tasters. Most other California wineries will be the same. So if you’re thinking of going wine tasting, plan to check conditions. We'll be posting updates on our website each morning. If it looks like this, we won't be open. We appreciate your flexibility and patience, and promise you wouldn't want to be tasting here anyway.

The kicker? Once fire and summer heat season are over, it will be because of rain. Gentle rain can be handled with umbrellas and heaters. A Pacific storm, with heavy rain and wind? Wineries will have to close for those too. So get used to thinking about a visit to go wine tasting as like a visit to the beach. Sure, make your plans. But also plan to check local conditions in the morning. Welcome to the new (2020) normal.

Veraison 2020 reflects our cool July and suggests a (gasp) normal start to harvest

The 2020 growing season has been a lovely antidote to all the chaos out in the world. Unlike many years, we've avoided both heat spikes and extended chilly periods. A graph of the daytime highs since May 1st gives a sense of how things have been distributed through July 22nd. You can see more 80s than 90s, plenty of 70s, and only three days (barely) in triple digits, one each month:

July has been particularly nice; our average high temperature so far this month has been 87.6°F. Compare that to the last three years, whose Julys averaged 91°F, 96.5°F, and 95.6°F. And remember, those are the high temperatures each day. Nights have been chilly, and it takes a while each morning for it to warm up. We haven't yet had a night this summer that didn't drop below 60°F, and our average nighttime low has been 47°F. That's kept the vineyard looking green and vibrant. The net result has been gradual progress by the vines and outstanding vine health.

Veraison, if you're unfamiliar with the term, is a physiological stage of grape evolution where the berry stops accumulating mass and starts accumulating sugar. More visibly, red grapes start their color change from green, while white grapes take on more of a yellow tint. Both red and white grapes start to soften. [For more about what's happening chemically, check out this veraison post from the archives.] This landmark comes roughly six weeks before the onset of harvest, and gives us our best estimate for when harvest will begin.

We didn't see any evidence of color in the vineyard until late last week, and it wasn't until this week that there was enough color change to be worth photographing. Now that it's started, I thought it would be fun to give you a visual tour. I'll start with Syrah, usually the first Rhone red to enter version and the fastest to change colors:

It's important to note that this cluster is somewhat more advanced than the average one. Even at the top of the hills, many of the Syrah clusters are green. At the bottom of the hills, there's very little color change to be found. And as for the other grapes, Mourvedre is the one where we're seeing significant color change. If you know that Mourvedre is almost always one of our last grapes to harvest, you might be surprised. But it isn't always last to enter veraison; it just takes a long time to go from first veraison to first harvest:

It took some significant searching by both Neil and me to find any color in Grenache. The best we could do is this one cluster, with a few red berries in a sea of green:

As for Counoise, it's still completely green. The cluster below is just one example; I could have pointed the camera just about anywhere and shown you more or less the same thing:

Although the veraison posts you're likely seeing from your favorite wineries may make it seem like veraison is a moment, like Christmas, it's probably better understood as a continuum, like winter, and first veraison is like first frost, or first snowfall. It will likely be a few weeks before even all the Syrah clusters are red, and probably six weeks until the last clusters of later grapes like Mourvedre and Counoise have finished coloring up. 

While six weeks is a good basic guide for the duration between veraison and harvest, it's not totally constant, and can be influenced by the weather that we get in the interim, as well as by the amount of fruit the vines are carrying and the inherent tendencies of the different varieties. For example, we noted first veraison on July 30th in both 2010 and 2019. In 2019, perfect ripening conditions (consistently very-warm-but-not-hot weather) in August and September gave us a short runup before our estate harvest began September 4th. In 2010 vintage, a very cool August delayed the start of harvest compared to 2019 by nearly two full weeks, to September 16th. The last decade is compiled in the chart below, with each year linked to my blog post about that year's veraison:

Year	First Veraison Noted	Estate Harvest Begins	# of Days
2010	July 30	September 16	48
2011	August 5	September 20	46
2012	July 25	September 5	42
2013	July 17	August 26	40
2014	July 9	August 23	45
2015	July 18	August 26	39
2016	July 13	August 18	36
2017	July 20	August 30	41
2018	July 29	September 10	43
2019	July 30	September 4	36
2020	July 21	?	?

Using the range of durations between first veraison and first harvest (36 to 48 days) we can have good confidence that we'll begin picking sometime between August 26th and September 7th. The weather between now and then will determine where in the range we'll fall. 

What's next for the vineyard? We'll watch the different grapes go through veraison. What starts like a trickle quickly becomes a flood, and the view in the vineyard changes daily. Grenache is sure to start to color up soon, and Counoise a bit later. White grapes too stretch out across a continuum; in fact, Viognier has already started veraison, although the visible changes are subtle enough that a photograph doesn't really show anything. Vermentino and Marsanne will move into veraison on the earlier side, Grenache Blanc and Picpoul in the middle, and Roussanne bringing up the rear, as usual. It's an exciting time. We'll be posting regular photos of veraison's progress on our Facebook, Twitter, and Instagram pages. In the cellar, we're bottling the last of our 2018 reds, refilling those barrels and foudres with our newly-blended 2019s, and starting the process of pulling out and cleaning all the tanks and equipment we'll be using once harvest begins.

So, while veraison doesn't mean we know exactly when we'll start to see fruit, it is the most useful signpost we have. And we know that the clock is ticking.

A last look back at the winter of 2019-20

This week, it finally feels like we've made the pivot from spring to summer. After several weeks of cool, wet weather, which delayed the spread of budbreak and encouraged an explosion of cover crop growth, this week it's sunny and warm. It's hit 82, 87, and 90 the last three days, quadrupling our total number of 80+ days in 2020. We're supposed to see another week or more of temperatures in the mid-to-upper 80s, and there's no rain on the horizon.

With that backdrop, I thought it would be a good time to look back on our most recent winter and see how it compares to other recent years. First, a look at rainfall by month:

You can see our late beginning to the rainy season (that November rainfall didn't start until the 26th), the wet December, a record-dry January and February, and the relatively wet last two months. Overall, with only limited prospects for additional precipitation, we're at 16.97" of rain for the winter, 71% of our 24-year average. That's lower than we'd like to see, of course, but with a wet winter last year, it's OK, and better than 10 of those 24 years:

In terms of temperature, we saw 30 below-freezing nights, with our first at the end of October and our last just two weeks ago, on April 7th. Over the last decade, we've averaged 34.5 below-freezing nights, so overall, this year was pretty normal. (If you're curious, our frostiest recent winter was 2011-12, with 57 below-freezing nights, and our least frosty was 2014-15, with just 13.) Our frostiest month was January, which, as you can see below, isn't always the case. Many years, it's too wet in January for it to drop below freezing. Compared to the rest of the last decade:

My sense that March and April were cooler than normal is reflected in the graph above, as well as in the fact that our average high temperatures in March (59.8°F) and April (65.5°F) were colder than the average highs in January (60°F) and February (68.3°F). I don't remember ever seeing that before!

The net result is a vineyard that's in excellent shape to attack the growing season with vigor. The cover crops are lush and deep, and Nathan is starting to cut and bale the sections that the flock couldn't get into in the last six or so weeks. You can see the height of the cover crops dramatically in the vineyard blocks where we've mowed every-other row, to give better air drainage and protect the new growth from frost:

So far, we've seen zero frost damage even from our couple of early-April below-freezing nights, as they affected only the lowest-lying areas, none of which had yet sprouted. The below Grenache block is in one of those lower areas, and it is healthy, vigorous, and doing its best to make up for lost time:  

This is one of my favorite times of year in the vineyard. Everything is still green, new growth is exploding out of the gnarled vine trunks, and the vineyard's patterns are starting to come into focus as we begin the long process of turning the cover crops under so they can decompose and provide nutrients to the vines' roots. It's going to be an even longer process than usual this year. The section in the valley in the below photo is Tannat that we turned under in late February, hoping to get a jump on the weeding process. It's already regrown. 

For scale, here's me in the Pinot Noir vineyard at my mom's house that is the source of the Tablas Creek Full Circle Pinot Noir. Not pictured: Sadie, who like the vines isn't tall enough to be visible in the high grass:

Overall, it's hard not to be optimistic. Wildflowers are everywhere, and the vineyard looks healthy and beautiful as we begin turning the cover crops under. If it's a little shaggier than normal for late April, well, it's not alone. We're all a bit overdue for a haircut.