Folsom, CA 95682 Frost Dates
Frost dates for Folsom, CA, ZIP 95682
Typically, the last spring freeze lands around 03/31, roughly 215 days out. The first fall frost typically arrives around 11/21, about 237 frost-free days later.
Folsom sits in USDA Zone 9b (25 to 30°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 9b around Folsom has about 12 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.
How much risk comes with planting early here
03/31 is the middle of 30 years of NOAA records, not a promise. Plant by 02/24 and you're betting against frost in roughly 9 years out of 10. 04/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Folsom compares
Folsom's growing season runs about 237 days, ranking 9,065 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,128 of 2,555.
Learn more
local microclimates explains what one yard in Folsom can differ from the 95682 normal, and zone vs. frost date explains why Zone 9b and Folsom's frost date answer different questions.