Twentynine Palms, CA 92385 Frost Dates
Frost dates for Twentynine Palms, CA, ZIP 92385
Typically, the last spring freeze lands around 03/06, roughly 190 days out. The first fall frost typically arrives around 12/08, about 272 frost-free days later.
Zone 8a (10 to 15°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 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
Twentynine Palms's growing season runs about 272 days, ranking 5,346 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,851 of 2,555.
Learn more
zone vs. frost date explains why Zone 8a and Twentynine Palms's frost date answer different questions, and the frost range explains how to read the range around Twentynine Palms's dates instead of trusting one.