Jackson, CA 95232 Frost Dates
Frost dates for Jackson, CA, ZIP 95232
Typically, the last spring freeze lands around 05/07, roughly 252 days out. The first fall frost typically arrives around 10/28, about 169 frost-free days later.
The USDA Plant Hardiness Zone Map puts Jackson in Zone 9a (20 to 25°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 9a around Jackson has about 9 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 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jackson compares
At roughly 169 frost-free days, Jackson places 29,411 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,391 of 2,555.
Learn more
local microclimates explains what one yard in Jackson can differ from the 95232 normal, and zone vs. frost date explains why Zone 9a and Jackson's frost date answer different questions.