​June and July in Napa Valley mark one of the most dynamic stretches of the growing season. Following fruit set in late spring, berries are now in the early stages of development, moving through a period of rapid cell division before entering the lag phase, when growth slows and the vine begins shifting its energy toward ripening. Growers are watching closely, walking rows and counting clusters to assess crop load and make early decisions about cluster thinning.
 
Meanwhile, canopy management is in full force. Teams are shoot positioning, hedging, and leaf pulling in the fruiting zone to improve air circulation and sun exposure, critical steps for managing disease pressure and encouraging even ripening. By late July, the valley's earliest varieties will begin veraison, the moment growers wait for all season: color change in red grapes, softening in whites, and the first true signal that harvest is on the horizon.
 
From fruit set to the first blush of veraison, every choice in the vineyard right now is a decision about the wine to come.

​Fruit set: The stage after flowering when fertilized blossoms develop into small green berries.
 
Lag phase: A mid-berry development period when cell division slows before sugar accumulation begins.
 
Cluster thinning: Removing excess grape clusters to concentrate the vine's energy into fewer, higher-quality fruit.
 
Canopy management: The collective practices used to train and shape vine foliage for optimal sun exposure and airflow.
 
Shoot positioning: Guiding young shoots upward and into the trellis wire to create an organized, open canopy. (photos above)
 
Hedging: Trimming shoot tips to control canopy height and direct vine energy into the fruit.
 
Leaf pulling: Removing leaves in the fruiting zone to improve light penetration and reduce disease risk.
 
Veraison: The onset of ripening, marked by color change in red varieties and softening in all grapes.

​If you spot vineyard crews digging holes, don’t worry, no one lost anything important. This is soil sampling season, and it’s one of the smartest ways growers prepare for the year ahead.

While grapevines are enjoying their winter dormancy, growers are busy learning what’s happening below the surface. Because when it comes to great wine, it all starts with the soil.

By digging soil pits and taking samples, growers can study:

• Nutrient levels (like nitrogen, potassium, and phosphorus)
• Soil texture (sand, silt, clay—or a mix)
• Drainage and compaction
• Organic matter

Think of it as a vineyard health check-up. The soil tells growers what the vines already have—and what they might need more (or less) of once growth begins.

If you’ve driven around Napa Valley lately, you’ve probably spotted big piles of vineyard wood sitting out in fields, ideally, each one neatly covered with a tarp. They may look mysterious, but they’re actually an important part of responsible vineyard stewardship.

When growers remove old or diseased vines, the woody material can’t just be hauled away or left in place. Those trunks and roots can harbor pests and diseases, and transporting them off-site risks spreading harmful organisms to other vineyards. The safest and most effective way to eliminate these threats is to burn the material on-site, but to do it cleanly.

That’s where NVG’s Low Smoke Agricultural Burning Program comes in. Growers stack vine piles and cover them with tarps to keep the centers dry during fall and winter rains. Dry wood burns hotter and cleaner, dramatically reducing smoke and helping protect the Valley’s air quality. Once the piles are fully “seasoned,” growers work with the Air District and the Ag Commissioner to burn them only on approved burn days.
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So those tarped piles you’re seeing? They’re a sign of careful planning and environmental responsibility. It’s one more way Napa Valley growers protect vineyard health while caring for the land and community we all share.

This harvest season in Napa Valley has been a study in contrasts: a stretch of classic cool mornings and bright afternoons punctuated by a few surprise rain showers that kept growers on alert. For those watching the skies as closely as the vines, this year’s weather has been a reminder of just how much temperature and timing shape the story of every vintage.

And while a little morning fog may have rolled in to keep things mysterious, Napa’s growers stayed focused and clear-headed even when the valley wasn’t.
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The Science Behind the Swing
Napa Valley’s Mediterranean climate is built on balance: warm, sunny days to ripen the fruit and cool nights to preserve its natural acidity. These diurnal temperature swings, often reaching 30–40°F between afternoon and pre-dawn, are what give Napa wines their structure and energy.

Daytime warmth drives photosynthesis, helping vines convert sunlight into sugars. As night falls, respiration slows, keeping acid levels intact and locking in the brightness that defines a balanced wine. It’s a delicate rhythm—and when the weather shifts, even slightly, growers adjust in kind.

Timing the Perfect Pick
This year’s early October rains briefly slowed harvest, adding an extra layer of strategy. Some growers raced to bring in early-ripening varieties before the clouds rolled in; others held steady, knowing the moisture could help refresh canopies and settle dust without harming quality.

Temperature remains the guiding factor even amid unpredictable weather. On cool mornings, grapes come in firm and vibrant; on warm days, the picking window tightens. Many crews began before sunrise this year to ensure fruit arrived at the winery cool, fresh, and bursting with flavor.

Consistent cool nights following those brief rain events allowed flavors to continue developing without spikes in sugar, helping preserve balance and freshness. The result will likely be wines of moderate alcohol, vibrant acidity, and expressive fruit—hallmarks of a beautifully tempered season.

And as the fog lifts on another Napa Valley harvest, one thing remains clear: excellence always rises with the morning light.

Every summer, Napa Valley vineyards stage a stunning transformation: grapes begin to change color in a process called veraison (that’s ver-ay-zhun, if you want to impress your friends).

But what the FOG is actually happening?

At veraison, grapes switch from growth mode to ripening mode. Until this point, berries are firm, green, and loaded with organic acids, but not much sugar. Then, as veraison begins, the chemistry inside each berry shifts dramatically:

​This color change is more than just a pretty picture—it’s a visible sign that grapes are softening, sugars are rising, and flavors are developing. The vine is investing energy into making berries attractive to birds and animals (nature’s seed dispersers), but in Napa Valley, we’re paying close attention for another reason: harvest is inching closer.

​And, of course, Napa Valley’s famed fog plays a quiet but critical role in this process. Those fog-cooled mornings temper the heat of summer days, slowing sugar accumulation and preserving the natural acidity that gives our wines their vibrancy. You could say the fog helps grapes find their best light—without overexposure.
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So next time you stroll past a vineyard and see berries turning color, know that you’re witnessing a fascinating natural shift—and that Napa’s growers are watching carefully, guided by experience, stewardship, and maybe just a little help from the morning fog.

​Summer is here, and while the valley is basking in sunshine, we’re here to clear the fog around one of the season’s most essential vineyard practices: irrigation. Even though vineyards might look lush and green, you might be surprised to learn how little water they actually use compared to other crops. With every drop counted, growers rely on precision tools and careful stewardship to ensure vines get just what they need—and not a drop more. So let’s lift the fog on how Napa Valley growers keep their vines hydrated while protecting this precious resource for our entire community.

​If you’ve driven past a vineyard lately and spotted folks darting between rows like grapevine whisperers, you’re not imagining things--May and June are some of the busiest months of the growing season. Crews are out early and often, walking the vines, checking progress, and giving the plants the TLC they need to grow into this year’s vintage.

There’s no slowing down now—this is the season of bloom, fruit set, and serious vine wrangling. Everything that happens in the next few weeks sets the stage for the grapes you’ll be sipping in a bottle down the road.
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Let’s de(mist)ify the action unfolding out in the vineyards right now, because it’s full steam ahead in the fog and sun!

If you’ve ever wandered through a Napa vineyard and heard a cheerful chorus of birdsong, you were likely listening to some of our hardest-working vineyard partners. That’s right--birds do more than just tweet and flit through the vines. They’re a vital part of sustainable grape growing in the Napa Valley.

Why Birds Belong in the Vineyard
From bluebirds to barn owls, a wide variety of bird species call our vineyards home—and for good reason. Grape growers invite them in! By providing safe nesting sites and preserving natural habitats, growers are encouraging birds to stick around. And that’s not just good for the birds—it’s great for the grapes.

Here’s the scoop: many birds love to snack on insects, rodents, and other vineyard pests. Instead of relying on chemicals, Napa growers often take a natural approach to pest control by welcoming birds as part of the team. Think of them as feathery farmhands, quietly keeping things in balance.

But let’s not wing it— not all birds are vineyard heroes. Flocking birds like starlings, blackbirds, and cedar waxwings can damage fruit and become pests, which is why growers sometimes need to use bird deterrents responsibly and in line with local regulations—to keep things clear and avoid flying into a fog of trouble.

Bird Boxes: Tiny Homes with Big Impact
​​This June, FOG is bringing the bird buzz to the Napa Farmers Market on the second Saturday with a fun, family-friendly activity: bird box decorating! Kids (and kids at heart) can get crafty while learning how bird boxes create safe spaces for nesting. These cozy shelters help support bird populations, especially species like Western Bluebirds that are known to help reduce bugs that munch on grapevines.

Whether you take your decorated box home to hang in your backyard or donate it to a local vineyard, you’re helping the ecosystem—and getting a closer look at the thoughtful ways growers care for their land.

​If you've ever been woken up by the low hum of wind machines on a cold spring night, you're not alone. These towering fans play a critical role in protecting Napa Valley’s vineyards from devastating frost damage, ensuring a successful grape harvest each year. While the noise can be surprising, the benefit they provide to local agriculture is immeasurable. Here’s why wind machines are an essential tool for our growers:

1. Wind Machines Prevent Crop Loss & Protect Local Agriculture
Frost can be disastrous for vineyards, especially in the early spring when tender grapevine buds are emerging. Just a few hours of below-freezing temperatures can destroy an entire season’s crop, leading to significant financial losses for farmers and impacting the wine industry. Wind machines help prevent this damage by maintaining a stable temperature around the vines, reducing the risk of frost-related destruction.

2. Wind Machines Use Natural Air Movement to Prevent Frost
On clear, still nights, cold air settles at ground level while a layer of warmer air sits just above it—this is called a temperature inversion. Wind machines work by pulling that warmer air down and mixing it with the cold air near the vines, raising the overall temperature and preventing frost formation. Unlike water-based frost protection methods, wind machines do not require large amounts of water, making them a sustainable choice, particularly during drought years.

3. Wind Machines Run for Just a Few Hours to Save an Entire Crop
We understand that wind machines can be noisy, but they typically operate only for a few hours during the coldest parts of the night—just long enough to protect the crop. Without them, frost could cause long-term economic losses, impacting not only farmers but also local businesses, wineries, and the entire community that depends on a thriving wine industry. Their short-term use yields long-term benefits, ensuring a sustainable future for Napa Valley agriculture.

Wind machines are a key component of responsible vineyard management, helping growers navigate the fog of unpredictable weather while reducing reliance on water-intensive frost protection methods. The next time you hear them humming in the night, know that they’re clearing the air and safeguarding the vineyards that make Napa Valley’s wines some of the best in the world.

When vineyards are redeveloped, Erosion Control Plans are created by expert civil engineers who understand the nuances of Napa’s terrain. These plans are then implemented by vineyard management companies or in-house farming teams who know every inch of the land. Together, they ensure the soil is protected while promoting clear, healthy watersheds.
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These measures are not just a safeguard for today but a vital preparation for the future. As intense rainstorms become more common with shifting climate patterns, erosion control is key to keeping our soils and streams resilient. It’s just one more way we let nothing—including precious soil—slip through the fog.