Vallejo, CA Frost Dates
The last spring frost in Vallejo usually comes around March 5 and the first fall frost around November 21.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | March 5 | November 21 |
| Hard freeze, 28°F | January 23 | December 5 |
Growing season: about 256 days.
Frequently asked questions
When is the last frost in Vallejo, CA?
The median date of the last spring frost (32°F) is March 5. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past March 5 lowers the risk for tender plants.
When is the first frost in Vallejo?
The median date of the first fall frost (32°F) is November 21, and a hard freeze (28°F) usually follows around December 5.
How long is the growing season in Vallejo?
About 256 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USW00093227. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.