Santa Rosa, CA 95407 Frost Dates
When can you plant in Santa Rosa, CA?
The last spring frost here typically falls around 02/25, about 181 days from today. The first fall frost typically arrives around 12/01, about 279 frost-free days later.
Santa Rosa 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
About 14 weeks of growing season left in Santa Rosa before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Santa Rosa's last frost
02/25 is the middle of 30 years of NOAA records, not a promise. Plant by 01/21 and you're betting against frost in roughly 9 years out of 10. 03/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Santa Rosa compares
About 279 days separate Santa Rosa's last and first frost, putting it 4,855 of 40,283 ZIP codes nationally. Within CA, it ranks 1,784 of 2,555.
Learn more
local microclimates covers what one yard in Santa Rosa can differ from the 95407 normal. zone vs. frost date covers why Zone 9a and Santa Rosa's frost date answer different questions.