Claremont, CA 91711 Frost Dates
Frost dates for Claremont, CA, ZIP 91711
The last spring frost here typically falls around 01/08, about 133 days from today. The first fall frost typically arrives around 12/28, about 354 frost-free days later.
Zone 10a (30 to 35°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 Claremont, not a forecast for this year.
What to do before the first frost
Zone 10a around Claremont has about 17 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
01/08 is the middle of 30 years of NOAA records, not a promise. Plant by 02/18 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Claremont compares
At roughly 354 frost-free days, Claremont places 2,178 of 40,283 ZIP codes in this dataset. Within CA, it ranks 980 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and Claremont's frost date answer different questions, and the frost range explains how to read the range around Claremont's dates instead of trusting one.