Sunnyvale, CA Frost Dates
The last spring frost in Sunnyvale usually comes around January 6 and the first fall frost around December 23.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | January 6 | December 23 |
| Hard freeze, 28°F | January 1 | December 31 |
Growing season: about 353 days.
Frequently asked questions
When is the last frost in Sunnyvale, CA?
The median date of the last spring frost (32°F) is January 6. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past January 6 lowers the risk for tender plants.
When is the first frost in Sunnyvale?
The median date of the first fall frost (32°F) is December 23, and a hard freeze (28°F) usually follows around December 31.
How long is the growing season in Sunnyvale?
About 353 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USW00023244. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.