Here is a link to the National Gardening Association's USDA Plant Hardiness Zones by zip code. Put in a 4 digit US zip code and it will tell you the plant hardiness zone. http://www.garden.org/zipzone/
Also a link to the more detailed Sunset Plant zoneshttp://www.sunset.com/garden/climate-zones/
Here is the Sunset description of my zone USDA 10: Sunset ZONE 22. Colder-winter Parts of Southern California's Coastal Region
Growing season: Mar. to early Dec. Winter lows seldom fall below 28 degrees F/-2 degrees C (records are around 21 degrees F/-6 degrees C), though colder air sinks to this zone from Zone 23. Summers are warm; rain comes in winter. Climate here is largely oceanic.