Suisun Valley AVA

The Suisun Valley takes its name from the indigenous Suisun people, Patwin dialect speakers whose name translates to 'where the west winds blow.' Commercial winemaking began in 1860 with C. Schultz & Company, and by 1909 over 2,000 acres were recorded under vine. Prohibition eliminated most operations, and recovery only began after World War II. The modern AVA was established in 1982 under the leadership of Chick Lanza and Ben Volkhardt. The valley was historically known for stone fruits and walnuts before the wine industry revival gained momentum from the 1960s onward.

• First commercial winery, C. Schultz & Company, opened in 1860
• Over 2,000 acres under vine recorded by 1909; Prohibition eliminated most operations
• AVA formally established December 27, 1982, led by Chick Lanza and Ben Volkhardt
• Western hillside plantings on volcanic rock began as recently as 2015

Suisun Valley sits east of Napa Valley, bordered by the Vaca Mountains to the east and the Howell and Mt. George Mountains to the west. The semi-coastal Mediterranean climate features a cool wet season from November through April and a warm dry season from May through October. Moist winds drawn in from San Francisco Bay and San Pablo Bay moderate temperatures and minimize frost danger, though fog rarely penetrates due to the valley's distance from the Pacific Ocean. Annual rainfall ranges from 20 to 30 inches, and the valley records a 14-degree daytime temperature differential between its upper and lower reaches.

• Semi-coastal Mediterranean climate with mid-Region III heat summation of 3,350 degree-days
• Maritime influence from San Francisco and San Pablo Bay winds reduces frost risk
• Elevation ranges from 100-200 feet on the valley floor to 2,162 feet at Twin Sisters to the west
• Fog rarely penetrates, providing warm days and cooler nights for balanced ripening

Suisun Valley features a diverse mosaic of soil types that supports a wide range of varietals. The valley floor is characterized by Brentwood clay loam, San Ysidro sandy loam, Sycamore silty loam, and Rincon clay loam, alongside alluvial soils deposited over time. The western hillsides, where newer plantings have been established since 2015, sit on volcanic rock. This combination of well-drained sandy loams, moisture-retaining clay loams, and mineral-rich volcanic substrates gives growers considerable flexibility in matching grape varieties to optimal sites.

• Valley floor soils include Brentwood clay loam, San Ysidro sandy loam, and Rincon clay loam
• Alluvial soils are also present throughout the valley floor
• Western hillside plantings sit on volcanic rock; these sites have been in production since 2015
• Diverse soil types support a wide range of both red and white varietals

Suisun Valley grows an exceptionally broad range of varietals, from Cabernet Sauvignon, Petite Sirah, Zinfandel, and Merlot among the reds to Chardonnay, Sauvignon Blanc, Viognier, and Roussanne among the whites. Less common plantings include Trousseau Noir, Malvasia Bianca, Napa Gamay (Valdiguie), Primitivo, and Muscat Canelli. The 14-degree temperature differential between the upper and lower valley allows growers to cultivate both warm-climate and cooler-climate varieties successfully. The appellation has developed a reputation as a super-premium grape-production district, with fruit frequently sourced by Napa and Sonoma wineries.

• Red strengths include Cabernet Sauvignon, Petite Sirah, Zinfandel, and Merlot
• White varieties include Chardonnay, Sauvignon Blanc, Viognier, and Roussanne
• Unusual plantings such as Trousseau Noir, Malvasia Bianca, and Valdiguie add diversity
• Fruit is frequently purchased by Napa and Sonoma wineries, indicating high quality benchmarks

Approximately 10 to 16 wineries currently operate within the Suisun Valley AVA, the majority family-owned boutique estates with tasting rooms concentrated in the valley. Notable producers include Wooden Valley Winery, Tolenas Winery, Caymus-Suisun, Lanza Vineyards, Vezér Family Vineyard, Blacksmith Cellars, King Andrews Vineyards, Sunset Cellars, and Bally Keal Estate. The appellation is recognized for delivering a quality-to-value ratio that compares favorably with Napa Valley, making it an increasingly attractive destination for wine lovers seeking serious California wines without the Napa price premium.

• Between 10 and 16 wineries currently operate, predominantly family-owned boutique estates
• Caymus-Suisun represents a high-profile connection to the broader California fine wine world
• Tasting rooms are concentrated within the valley, supporting direct-to-consumer sales
• Strong quality-to-value reputation positions the AVA as an alternative to Napa Valley