Yolo County AVA

Yolo County sits at the northern end of California's Central Valley, positioned between Sacramento and Napa Valley roughly one hour from San Francisco. The county spans 1,021 square miles of highly variable terrain, from the near sea-level delta flatlands of Clarksburg and Merritt Island in the east to the rugged Coastal Range slopes of Capay Valley, which climbs from 330 to 2,460 feet. This topographic diversity underpins the character of five distinct sub-AVAs, each with its own soils and mesoclimate.

• Elevation ranges from below sea level in Clarksburg to 2,460 feet in Capay Valley
• Eastern sub-AVAs border the Sacramento River delta; western sub-AVAs push into the Coastal Range foothills
• Primarily agricultural county where viticulture shares land with major tomato production
• Proximity to both Napa Valley and Sacramento makes it an accessible yet underexplored region

Yolo County's climate varies considerably across its sub-AVAs. Clarksburg and Merritt Island benefit from cooling maritime influence delivered by the Sacramento River and coastal fog, producing cool-climate-style wines despite their Central Valley address. Dunnigan Hills and Capay Valley sit warmer, with greater diurnal temperature swings that concentrate flavors in the fruit. Winters Highlands, on Coastal Range slopes, features volcanic-origin soils that provide excellent drainage. Clarksburg's alluvial clay and silt soils contrast sharply with the free-draining red gravel loams of Dunnigan Hills and the rocky volcanic soils of Capay Valley.

• Clarksburg and Merritt Island cooled by Sacramento River breezes and coastal fog
• Dunnigan Hills and Capay Valley are warmer with pronounced day-to-night temperature variation
• Soils range from alluvial clay and silt to volcanic ash, creek rock, and free-draining red gravel loam
• Winters Highlands volcanic soils sit on Coastal Range slopes at 100 to 400 feet elevation

Yolo County's diversity of climates and soils supports an exceptionally broad grape palette of over 30 varieties. Chenin Blanc and Chardonnay thrive in the cooler, fog-influenced zones of Clarksburg, producing whites with lively acidity. Petite Sirah, Syrah, Tempranillo, Viognier, and Albariño find homes across the warmer western sub-AVAs, alongside Cabernet Sauvignon, Malbec, Garnacha, Zinfandel, Sangiovese, and Merlot. The region's wines span cool-climate-style expressions from Clarksburg to more concentrated, fruit-forward reds from Dunnigan Hills and Capay Valley.

• Chenin Blanc is a signature variety in Clarksburg, benefiting from the sub-AVA's cool delta conditions
• Petite Sirah and Syrah perform well in the warmer western sub-AVAs
• Iberian and Rhône varieties including Tempranillo, Garnacha, Albariño, and Viognier are well established
• White wines from cooler zones show vibrant acidity; reds from warmer zones offer concentrated fruit

Yolo County was one of California's original 18 counties, formed in 1850 and originally named Fremont. Winemaking arrived during the Gold Rush of the 1850s, with John Gillig establishing the county's first winery in 1860. The industry was largely abandoned during Prohibition in the 1920s. Revival began in earnest in Clarksburg, where commercial vineyard development started in 1963 and the first commercial wineries opened in 1979. The county is also home to UC Davis, California's most celebrated oenological college and the region's largest employer.

• Formed in 1850 as one of California's original 18 counties, originally named Fremont
• John Gillig established the first winery in 1860; industry largely halted by Prohibition in the 1920s
• Clarksburg commercial vineyard development began 1963; first commercial wineries opened 1979
• UC Davis, located in the county, is the state's foremost wine research and education institution

The county's wine industry is dominated by family-owned operations, with a handful of producers that have achieved recognition beyond the region. Bogle Vineyards is among the most widely distributed names associated with the area. Matchbook Wine Company, Berryessa Gap Vineyards, Séka Hills, and Turkovich Family Wines represent the range of styles found across the sub-AVAs. Capay Valley Vineyards, Grindstone Wines, Great Bear Vineyards, and Elevation Ten Winery round out a diverse, largely artisan producer landscape. R.H. Phillips played an important historical role in establishing the region's reputation.

• Bogle Vineyards is one of the most widely recognized producers from the Yolo County area
• Séka Hills and Berryessa Gap Vineyards are notable for showcasing Capay Valley and Dunnigan Hills terroir
• Most producers are family owned and small-scale, reflecting the region's agricultural character
• R.H. Phillips was a historically significant producer in building the region's early commercial profile