Jackson, CA 95665 Frost Dates
Frost dates for Jackson, CA, ZIP 95665
Around 01/22 is the usual last spring frost, about 147 days away. The first fall frost typically arrives around 12/17, about 332 frost-free days later.
Jackson sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 9a around Jackson has about 16 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.
The actual range around Jackson's last frost
01/22 is the middle of 30 years of NOAA records, not a promise. Plant by 03/01 and you're betting against frost in roughly 9 years out of 10. 12/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jackson compares
Jackson's growing season runs about 332 days, ranking 2,891 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,303 of 2,555.
Learn more
zone vs. frost date explains why Zone 9a and Jackson's frost date answer different questions, and the frost range explains how to read the range around Jackson's dates instead of trusting one.