Poway, CA 92128 Frost Dates
Frost dates for Poway, CA, ZIP 92128
Typically, the last spring freeze lands around 02/02, roughly 158 days out. The first fall frost typically arrives around 12/07, about 309 frost-free days later.
Poway sits in USDA Zone 10a (30 to 35°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 10a 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.
Why 02/02 isn't a guarantee
02/02 is the middle of 30 years of NOAA records, not a promise. Plant by 03/04 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 Poway compares
At roughly 309 frost-free days, Poway places 3,640 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,491 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 92128 normal.