I have always been zone 7 don't know if a or b but we also have Sunset zones.
Guess I'm a 6 or 7 in that area. I don't know if mine has changed w/ the new set up. This chart was put up here August of 2011. So would this one be current or did it change this year?
The Sunset zones, popularized and researched by Sunset Magazine, are derived from climate zones developed by the University of California Cooperative Extension. Sunset zones are based on a combination of extremes and averages of minimum, maximum, and mean temperature, rainfall, humidity, and the length of the growing season.
USDA zones are more widely used. These zones are based on the average minimum temperature in a given region.
To the right is a general conversion chart of USDA zones: (Note that the Sunset equivalent zones are rough approximations and do not correlate completely with the USDA zones.)