Santa Rosa, CA 95404 Frost Dates
95404, near Santa Rosa, CA: the frost window
Around 02/25 is the usual last spring frost, about 181 days away. Fall's first freeze usually shows up around 12/01, roughly 279 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Santa Rosa in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Santa Rosa's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Santa Rosa's last frost
02/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Santa Rosa against the rest of the dataset
At roughly 279 frost-free days, Santa Rosa places 4,852 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,781 of 2,555.
Learn more
Two guides worth reading on 95404: local microclimates, on what one yard in Santa Rosa can differ from the 95404 normal, and zone vs. frost date, on why Zone 9b and Santa Rosa's frost date answer different questions.