Napa Valley grows the most cabernet sauvignon in California.
Although the Napa Valley is a small region and produces just 4% of all California wine, it does lead in cabernet acreage. According to the California Agricultural Statistics Service, Napa had 21,665 acres of cabernet sauvignon as of 2018. Second in line was San Luis Obispo County (which includes Paso Robles) with 14,752 acres. Yes, Sonoma is third with 12,478 acres.