When is the last frost in Vacaville, CA?

For ZIP code 95688, the average last spring frost (32°F) is January 31, based on NOAA 1991-2020 climate normals for the Vacaville, CA weather station. There is a 1-in-10 chance of a frost after March 11.

When is the first frost in Vacaville, CA?

The average first fall frost (32°F) is December 11. There is a 1-in-10 chance of frost by November 24, so tender plants are at risk from that point on.

How long is the growing season in 95688?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 318 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 95688Vacaville, CA

The average last spring frost in Vacaville is January 31 and the average first fall frost is December 11, giving a typical growing season of about 318 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 31
Average first fall frost: Dec 11
Growing season: 318 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	Feb 4 · Mar 8 · Apr 7	Nov 10 · Nov 26 · Dec 13	259 days	100%
Frost / freeze (32°F)	Dec 30 · Jan 31 · Mar 11	Nov 24 · Dec 11 · Jan 12	318 days	95%
Hard freeze (28°F)	Dec 16 · Jan 6 · Jan 31	Dec 4 · Dec 23 · Jan 19	361 days	54%

Where these dates come from

ZIP code 95688 is matched to the NOAA station Vacaville, CA, 2.7 km away, at 110 ft elevation (169 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Vacaville, CA (used)	110 ft	Jan 31	Dec 11
Vacaville Nut Tree Ap, CA	109 ft	Feb 18	Nov 28
Lake Solano, CA	187 ft	Feb 4	Dec 5
Fairfield, CA	40 ft	Jan 15	Dec 14

Frost dates near Vacaville

Vacaville, CA 95687 · last Feb 18, first Nov 28
Elmira, CA 95625 · last Feb 18, first Nov 28
Travis Afb, CA 94535 · last Jan 15, first Dec 14
Fairfield, CA 94533 · last Jan 15, first Dec 14
Winters, CA 95694 · last Feb 18, first Nov 30
Suisun City, CA 94585 · last Jan 15, first Dec 14
Dixon, CA 95620 · last Feb 10, first Dec 1
Napa, CA 94558 · last Apr 7, first Dec 5

Frequently asked questions

When is the last frost in Vacaville, CA?: For ZIP code 95688, the average last spring frost (32°F) is January 31, based on NOAA 1991-2020 climate normals for the Vacaville, CA weather station. There is a 1-in-10 chance of a frost after March 11.
When is the first frost in Vacaville, CA?: The average first fall frost (32°F) is December 11. There is a 1-in-10 chance of frost by November 24, so tender plants are at risk from that point on.
How long is the growing season in 95688?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 318 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.