Mendota, CA 93640 Frost Dates
Frost dates for Mendota, CA, ZIP 93640
The last spring frost here typically falls around 02/12, about 168 days from today. The first fall frost typically arrives around 11/30, about 293 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mendota in Zone 9a (20 to 25°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
Zone 9a around Mendota has about 13 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 02/12 isn't a guarantee
02/12 is the middle of 30 years of NOAA records, not a promise. Plant by 01/06 and you're betting against frost in roughly 9 years out of 10. 03/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mendota compares
About 293 days separate Mendota's last and first frost, putting it 4,286 of 40,283 ZIP codes nationally. Within CA, it ranks 1,662 of 2,555.
Learn more
local microclimates explains what one yard in Mendota can differ from the 93640 normal, and zone vs. frost date explains why Zone 9a and Mendota's frost date answer different questions.