Perris, CA 92570 Frost Dates
Frost dates for Perris, CA, ZIP 92570
Around 01/28 is the usual last spring frost, about 153 days away. The first fall frost typically arrives around 12/18, about 329 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 Perris, not a forecast for this year.
What to do before the first frost
Zone 9b around Perris 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.
Why 01/28 isn't a guarantee
01/28 is the middle of 30 years of NOAA records, not a promise. Plant by 02/27 and you're betting against frost in roughly 9 years out of 10. 12/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Perris compares
Perris's growing season runs about 329 days, ranking 3,078 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,331 of 2,555.
Learn more
local microclimates explains what one yard in Perris can differ from the 92570 normal, and zone vs. frost date explains why Zone 9b and Perris's frost date answer different questions.