Poway, CA 91903 Frost Dates
Frost dates for Poway, CA, ZIP 91903
The last spring frost here typically falls around 03/04, about 188 days from today. The first fall frost typically arrives around 12/04, about 270 frost-free days later.
Poway sits in USDA Zone 9b (25 to 30°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 9b 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
About 270 days separate Poway's last and first frost, putting it 5,481 of 40,283 ZIP codes nationally. Within CA, it ranks 1,901 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 91903 normal.