Vallejo, CA 94590 Frost Dates
When can you plant in Vallejo, CA?
The last spring frost here typically falls around 03/05, about 189 days from today. The first fall frost typically arrives around 11/21, about 256 frost-free days later.
Vallejo sits in USDA Zone 9b (25 to 30°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 12 weeks of growing season left in Vallejo before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/05 isn't a guarantee
03/05 is the middle of 30 years of NOAA records, not a promise. Plant by 01/26 and you're betting against frost in roughly 9 years out of 10. 04/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Vallejo compares
About 256 days separate Vallejo's last and first frost, putting it 6,783 of 40,283 ZIP codes nationally. Within CA, it ranks 2,061 of 2,555.
Learn more
local microclimates covers what one yard in Vallejo can differ from the 94590 normal. zone vs. frost date covers why Zone 9b and Vallejo's frost date answer different questions.