Claremont, CA 91759 Frost Dates
Frost dates for Claremont, CA, ZIP 91759
The last spring frost here typically falls around 05/16, about 261 days from today. The first fall frost typically arrives around 10/13, about 151 frost-free days later.
Claremont sits in USDA Zone 8a (10 to 15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 8a around Claremont has about 7 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.
The actual range around Claremont's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 06/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Claremont compares
About 151 days separate Claremont's last and first frost, putting it 34,942 of 40,283 ZIP codes nationally. Within CA, it ranks 2,432 of 2,555.
Learn more
local microclimates explains what one yard in Claremont can differ from the 91759 normal, and zone vs. frost date explains why Zone 8a and Claremont's frost date answer different questions.