Twentynine Palms, CA 92277 Frost Dates
When can you plant in Twentynine Palms, CA?
The last spring frost here typically falls around 02/28, about 184 days from today. The first fall frost typically arrives around 12/01, about 273 frost-free days later.
The USDA Plant Hardiness Zone Map puts Twentynine Palms in Zone 9b (25 to 30°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
About 14 weeks of growing season left in Twentynine Palms before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 02/28 isn't a guarantee
02/28 is the middle of 30 years of NOAA records, not a promise. Plant by 01/21 and you're betting against frost in roughly 9 years out of 10. 03/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Twentynine Palms compares
About 273 days separate Twentynine Palms's last and first frost, putting it 5,190 of 40,283 ZIP codes nationally. Within CA, it ranks 1,829 of 2,555.
Learn more
local microclimates covers what one yard in Twentynine Palms can differ from the 92277 normal. zone vs. frost date covers why Zone 9b and Twentynine Palms's frost date answer different questions.