Sonoma Valley is an American Viticultural Area (AVA) located within the Sonoma Valley landform occupying the southeastern portion of Sonoma County, California. The name "Sonoma" means 'Valley of the Moon' in the indigenous Chocuyen dialect. The wine appellation was established on December 4, 1981, as the nation's ninth, the state's seventh and the county's initial AVA by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by the Sonoma Valley Vintners Association of Santa Rosa, on behalf of Sonoma Valley wineries and grape growers proposing the new viticultural area named "Sonoma Valley."
The 72,402-acre (113 sq mi) viticultural area cultivates 13,000 acres (5,300 ha) under vine and is flanked by two mountain ranges: the Mayacamas Mountains to the east and the Sonoma Mountains to the west. The plant hardiness zone ranges from 9a to 10a.