Sonoma, CA 95476 Frost Dates
When can you plant in Sonoma, CA?
The last spring frost here typically falls around 03/02, about 186 days from today. The first fall frost typically arrives around 11/27, about 270 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sonoma 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
About 13 weeks of growing season left in Sonoma before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/02 isn't a guarantee
03/02 is the middle of 30 years of NOAA records, not a promise. Plant by 01/27 and you're betting against frost in roughly 9 years out of 10. 04/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sonoma compares
At roughly 270 frost-free days, Sonoma places 5,566 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,978 of 2,555.
Learn more
the frost range covers how to read the range around Sonoma's dates instead of trusting one. local microclimates covers what one yard in Sonoma can differ from the 95476 normal.