Cupertino, CA 95014 Frost Dates
Frost dates for Cupertino, CA, ZIP 95014
Around 01/06 is the usual last spring frost, about 131 days away. The first fall frost typically arrives around 12/23, about 353 frost-free days later.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Cupertino, not a forecast for this year.
What to do before the first frost
Zone 9b around Cupertino has about 17 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 01/06 isn't a guarantee
01/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/04 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cupertino compares
At roughly 353 frost-free days, Cupertino places 2,220 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,000 of 2,555.
Learn more
the frost range explains how to read the range around Cupertino's dates instead of trusting one, and local microclimates explains what one yard in Cupertino can differ from the 95014 normal.