Alexander Valley Sonoma County, California The Alexander Valley AVA follows the Russian River through northeastern Sonoma County . It was declared an AVA in 1984. Alexander Valley Winegrowers Wineries: Alexander Valley Vineyards Chateau Souverain Don Sebastiani & Sons Field Stone Foppiano Vineyards Geyser Peak Winery Jordan Mazzocco Winery Nob Hill Trading Co. Sausal Winery Silver Oak Simi Winery Teldeschi Winery Trentadue Winery White Oak Vineyards & Winery