Sierra Foothills California The Sierra Foothills AVA follows the piedmont of the mountains through parts of Yuba, Nevada, Placer, El Dorado, Amador, Calaveras, Tuolumne and Mariposa Counties and encompasses several smaller AVAs. Vineyards & Wineries: Bargetto Winery Deaver Vineyards MonteVina Mt. Vernon Winery Renwood Santino Regions within the Sierra Foothills: Fair Play Fiddletown Shenandoah Valley