There are 149 American Viticultural Areas (AVAs) in California, a number which is ever increasing. From Mendocino County in the North Coast all the way down to the southern border with Mexico, from coastal regions lining the Pacific Ocean to vineyards flanking the Sierra Nevada foothills, each of the areas boast characteristics that are uniquely their own. These local differences support the cultivation of a wide range of grape varieties and shape a diverse range of wines.

Our regional study guides are authored by local experts, who draw from their first-hand knowledge and experience in these grape growing areas. Whether you’re preparing for a trip to the Golden State or seeking an educational deep-dive into one of its lesser-known sub-regions, here is where you will find information on regional history, geography, climate, soil, signature wines, benchmark wineries, maps and statistics.