La Mesa, CA 92119 Frost Dates
Frost dates for La Mesa, CA, ZIP 92119
Around 01/06 is the usual last spring frost, about 131 days away. The first fall frost typically arrives around 12/21, about 350 frost-free days later.
Zone 10b (35 to 40°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 La Mesa, not a forecast for this year.
What to do before the first frost
Zone 10b around La Mesa has about 16 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 La Mesa's last frost
01/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/07 and you're betting against frost in roughly 9 years out of 10. 12/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How La Mesa compares
At roughly 350 frost-free days, La Mesa places 2,324 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,030 of 2,555.
Learn more
zone vs. frost date explains why Zone 10b and La Mesa's frost date answer different questions, and the frost range explains how to read the range around La Mesa's dates instead of trusting one.