From University of Calif re San Diego county.
When and Where to Plant: Tomatoes are warm season vegetables. They should be planted after the
danger of frost has passed and the soil is warm. It is usually safe to set out transplants in early March
near the coast and two to four weeks later in coastal valleys. Earlier planting is possible if plants are
protected with hot caps or row covers; however, early plantings often do not produce fruit much
sooner than plants set out later when temperatures are more favorable. Spring planted tomatoes
usually produce fruit during the summer for two to three months. It is best to make a second planting
in June or early July if you want to harvest tomatoes during the fall. For best production, tomatoes
should be planted in a location where they will receive at least eight hours of sunlight a day.
https://www.mastergardenerssandiego....ato%20Tips.pdf