California has over 427,000 acres (1,730 km) planted under vines mostly located in a stretch of land covering over 700 miles (1,100 km) from Mendocino County to the southwestern tip of Riverside County. There are over 107 American Viticultural Areas (AVAs), including the well - known Napa, Russian River Valley, Rutherford and Sonoma Valley AVAs. The Central Valley is California 's largest wine region stretching for 300 miles (480 km) from the Sacramento Valley south to the San Joaquin Valley. This one region produces nearly 75 % of all California wine grapes and includes many of California 's bulk, box and jug wine producers like Gallo, Franzia and Bronco Wine Company.
where is the most wine produced in california
The Central Valley