Vacaville, CA 95625 Frost Dates
When can you plant in Vacaville, CA?
Around 02/18 is the usual last spring frost, about 174 days away. 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
About 13 weeks of growing season left in Vacaville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 4,730 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,740 of 2,555.
Learn more
zone vs. frost date covers why Zone 9b and Vacaville's frost date answer different questions. the frost range covers how to read the range around Vacaville's dates instead of trusting one.