Petaluma, CA 94952 Frost Dates
Frost dates for Petaluma, CA, ZIP 94952
Typically, the last spring freeze lands around 02/28, roughly 184 days out. The first fall frost typically arrives around 11/25, about 271 frost-free days later.
The USDA Plant Hardiness Zone Map puts Petaluma 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 Petaluma has about 13 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.
How much risk comes with planting early here
02/28 is the middle of 30 years of NOAA records, not a promise. Plant by 01/24 and you're betting against frost in roughly 9 years out of 10. 04/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Petaluma compares
At roughly 271 frost-free days, Petaluma places 5,414 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,870 of 2,555.
Learn more
the frost range explains how to read the range around Petaluma's dates instead of trusting one, and local microclimates explains what one yard in Petaluma can differ from the 94952 normal.