Twentynine Palms, CA 92378 Frost Dates
Frost dates for Twentynine Palms, CA, ZIP 92378
The last spring frost here typically falls around 03/06, about 190 days from today. The first fall frost typically arrives around 12/08, about 272 frost-free days later.
The USDA Plant Hardiness Zone Map puts Twentynine Palms in Zone 8a (10 to 15°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 8a around Twentynine Palms has about 15 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 03/06 isn't a guarantee
03/06 is the middle of 30 years of NOAA records, not a promise. Plant by 01/17 and you're betting against frost in roughly 9 years out of 10. 04/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Twentynine Palms compares
At roughly 272 frost-free days, Twentynine Palms places 5,345 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,850 of 2,555.
Learn more
local microclimates explains what one yard in Twentynine Palms can differ from the 92378 normal, and zone vs. frost date explains why Zone 8a and Twentynine Palms's frost date answer different questions.