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One unofficial source listsOne 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