Reporting
One unofficial source lists

One unofficial source lists as last expected spring frost 1/24, first expected fall frost 12/8. To be sure, however, we'd suggest contacting your nearest branch of the National Weather Service. You might try:

 

National Weather Service
San Francisco/Monterey Bay Area Weather Forecast Office
21 Grace Hopper Ave, Stop 5
Monterey, CA 93943-5505
Tel: (831)-656-1725