Sonoma Valley Often called the birthplace of California's commercial wine industry, the Sonoma Valley AVA is a historic and diverse region. It is flanked by the Sonoma and Mayacamas Mountains, which protect it from excessive coastal influence while still benefiting from the cooling fog that funnels through the Petaluma Gap. This climate creates a versatile growing region, making it well-suited for a wide variety of grapes. It is particularly known for its elegant Chardonnay, robust Cabernet Sauvignon, and classic Zinfandel, along with historic field blends.

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Russian River Valley World-renowned for its cool-climate wines, the Russian River Valley AVA is defined by the cooling maritime fog that flows inland from the Pacific Ocean along the path of the Russian River. This characteristic "fog blanket" creates a slow, extended growing season, which is ideal for developing complex flavors while preserving acidity in the grapes. The region has earned international acclaim for its exceptional, Burgundian-style Pinot Noir and Chardonnay, which are known for their balance, elegance, and depth. It is also a key source for high-quality grapes used in sparkling wine production.

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Dry Creek Valley Just northwest of Healdsburg lies the Dry Creek Valley, a compact and premium wine-growing region recognized as one of the world's premier appellations for Zinfandel. The valley's unique geography—it is just sixteen miles long and two miles wide—creates a distinct climate. The days are warm, ideal for ripening grapes, but are followed by cooler evenings. This climate, combined with its gravelly, well-draining soils, is perfect for producing bold, concentrated "old vine" Zinfandel. The region also has a stellar reputation for crisp, refreshing Sauvignon Blanc.