Napa, CA Frost Dates
The last spring frost in Napa usually comes around February 12 and the first fall frost around December 4.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | February 12 | December 4 |
| Hard freeze, 28°F | January 11 | December 19 |
Growing season: about 299 days.
Frequently asked questions
When is the last frost in Napa, CA?
The median date of the last spring frost (32°F) is February 12. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past February 12 lowers the risk for tender plants.
When is the first frost in Napa?
The median date of the first fall frost (32°F) is December 4, and a hard freeze (28°F) usually follows around December 19.
How long is the growing season in Napa?
About 299 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USC00046074. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.