Twentynine Palms, CA 92338 Frost Dates
Frost dates for Twentynine Palms, CA, ZIP 92338
Typically, the last spring freeze lands around 03/01, roughly 185 days out. The first fall frost typically arrives around 11/29, about 271 frost-free days later.
Zone 9a (20 to 25°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 Twentynine Palms, not a forecast for this year.
What to do before the first frost
Zone 9a around Twentynine Palms has about 13 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 03/01 isn't a guarantee
03/01 is the middle of 30 years of NOAA records, not a promise. Plant by 01/24 and you're betting against frost in roughly 9 years out of 10. 03/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Twentynine Palms compares
About 271 days separate Twentynine Palms's last and first frost, putting it 5,418 of 40,283 ZIP codes nationally. Within CA, it ranks 1,874 of 2,555.
Learn more
local microclimates explains what one yard in Twentynine Palms can differ from the 92338 normal, and zone vs. frost date explains why Zone 9a and Twentynine Palms's frost date answer different questions.