Poway, CA 92177 Frost Dates
Frost dates for Poway, CA, ZIP 92177
Typically, the last spring freeze lands around 03/04, roughly 188 days out. The first fall frost typically arrives around 12/04, about 270 frost-free days later.
The USDA Plant Hardiness Zone Map puts Poway in Zone 10b (35 to 40°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 10b around Poway 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.
The actual range around Poway's last frost
03/04 is the middle of 30 years of NOAA records, not a promise. Plant by 01/29 and you're betting against frost in roughly 9 years out of 10. 04/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Poway compares
At roughly 270 frost-free days, Poway places 5,543 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,963 of 2,555.
Learn more
the frost range explains how to read the range around Poway's dates instead of trusting one, and local microclimates explains what one yard in Poway can differ from the 92177 normal.