USDA zones are useful for judging whether to grow ceratin perrenials. Has little meaning for annuals, whicludes most vegetables. It is based on minimum winter temps. Lenght of season and summer temps are the most important factor in growing vegetables. Lenght of season is approximately the distance between last frost (spring) and first frost (fall) You are in southern California, so you most likely have few limits on what to grow climate wise. Accoding to weather data from Camarillo Airport, the lowest temp ever recorded is 25 degrees Fahrenheit, but otherwise rarely drops below 40. USDA Z10 As you go farther inland and higher elevations you might find a Z8
