Sebastopol, CA 94955 Frost Dates
Frost dates for Sebastopol, CA, ZIP 94955
Around 01/29 is the usual last spring frost, about 154 days away. The first fall frost typically arrives around 12/30, about 347 frost-free days later.
Sebastopol sits in USDA Zone 9a (20 to 25°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 9a around Sebastopol has about 18 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 01/29 isn't a guarantee
01/29 is the middle of 30 years of NOAA records, not a promise. Plant by 03/17 and you're betting against frost in roughly 9 years out of 10. 12/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sebastopol compares
About 347 days separate Sebastopol's last and first frost, putting it 2,403 of 40,283 ZIP codes nationally. Within CA, it ranks 1,090 of 2,555.
Learn more
zone vs. frost date explains why Zone 9a and Sebastopol's frost date answer different questions, and the frost range explains how to read the range around Sebastopol's dates instead of trusting one.