Twentynine Palms, CA 92391 Frost Dates
Twentynine Palms, CA: when does the frost end?
Typically, the last spring freeze lands around 03/06, roughly 190 days out. Fall's first freeze usually shows up around 12/08, roughly 272 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 15 weeks until Twentynine Palms's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/06 isn't a guarantee
03/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/09 and only about 1 year in 10 sees frost after that.
Twentynine Palms against the rest of the dataset
About 272 days separate Twentynine Palms's last and first frost, putting it 5,347 of 40,283 ZIP codes nationally. Within CA, it ranks 1,852 of 2,555.
Learn more
Before leaning on 92391's figures: local microclimates explains what one yard in Twentynine Palms can differ from the 92391 normal, while zone vs. frost date explains why Zone 8a and Twentynine Palms's frost date answer different questions.