Sebastopol, CA 95430 Frost Dates
95430, near Sebastopol, CA: the frost window
The last spring frost here typically falls around 01/29, about 154 days from today. Fall's first freeze usually shows up around 12/30, roughly 347 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Sebastopol, not a forecast for this year.
Stretching the season past the first frost
Sebastopol's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
01/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/17 and only about 1 year in 10 sees frost after that.
Sebastopol against the rest of the dataset
Sebastopol's growing season runs about 347 days, ranking 2,409 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,096 of 2,555.
Learn more
Two guides worth reading on 95430: local microclimates, on what one yard in Sebastopol can differ from the 95430 normal, and zone vs. frost date, on why Zone 9b and Sebastopol's frost date answer different questions.