San Jose, CA 95127 Frost Dates
Frost dates for San Jose, CA, ZIP 95127
Around 01/02 is the usual last spring frost, about 127 days away. The first fall frost typically arrives around 12/25, about 362 frost-free days later.
The USDA Plant Hardiness Zone Map puts San Jose in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9b around San Jose 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 01/02 isn't a guarantee
01/02 is the middle of 30 years of NOAA records, not a promise. Plant by 01/23 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How San Jose compares
At roughly 362 frost-free days, San Jose places 2,053 of 40,283 ZIP codes in this dataset. Within CA, it ranks 939 of 2,555.
Learn more
local microclimates explains what one yard in San Jose can differ from the 95127 normal, and zone vs. frost date explains why Zone 9b and San Jose's frost date answer different questions.