Paso Robles AVA
Paso Robles is an American Viticultural Area (AVA) located in northern San Luis Obispo (SLO) County, California. It was established as the nation's 44th, the state's 29th and the county's fourth wine appellation on October 4, 1983 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by Martin Brothers Winery accompanied by 51 signatures of local grape-growers and wineries proposing a viticultural area named "Paso Robles." At the outset, the viticultural area encompassed 609,673 acres (953 sq mi) with approximately 18,500 acres (7,487 ha) cultivating wine grapes known for their heritage varietal Zinfandel, Cabernet Sauvignon, and Rhône-style wines.