Lathrop, CA 95231 Frost Dates
Frost dates for Lathrop, CA, ZIP 95231
Around 02/06 is the usual last spring frost, about 162 days away. The first fall frost typically arrives around 12/01, about 304 frost-free days later.
The USDA Plant Hardiness Zone Map puts Lathrop 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
Zone 9b around Lathrop has about 14 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 02/06 isn't a guarantee
02/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 12/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lathrop compares
At roughly 304 frost-free days, Lathrop places 3,754 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,519 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and Lathrop's frost date answer different questions, and the frost range explains how to read the range around Lathrop's dates instead of trusting one.