Vacaville, CA 95696 Frost Dates
Frost dates for Vacaville, CA, ZIP 95696
Typically, the last spring freeze lands around 02/18, roughly 174 days out. The first fall frost typically arrives around 11/28, about 283 frost-free days later.
Vacaville 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
Zone 9b around Vacaville has about 13 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
02/18 is the middle of 30 years of NOAA records, not a promise. Plant by 01/11 and you're betting against frost in roughly 9 years out of 10. 03/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Vacaville compares
Vacaville's growing season runs about 283 days, ranking 4,733 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,743 of 2,555.
Learn more
the frost range explains how to read the range around Vacaville's dates instead of trusting one, and local microclimates explains what one yard in Vacaville can differ from the 95696 normal.