Check what diseases you may be dealing with here: UC IPM. The most common in the extended Bay Area are Downy Mildew, Fire Blight, Black Spot, Rust, and Tomato Spotted Wilt Virus.
Check what pests you may be dealing with here: UC IPM. The most common in the extended Bay Area are Aphids, Mealy Bugs, Spider Mites, and Thrips.
Check what pests you may be dealing with here: UC IPM. The most common in the extended Bay Area are Pocket Gophers, Birds, and Ground Squirrels.
USDA Hardiness Zone Map
Northern California USDA Hardiness Zone Map
American Horticultural Society Heat Index Map