Frost dates for Sunnyvale, California
In a typical year, Sunnyvale’s last spring frost lands around Jan 6 and the first fall frost around Dec 23, a growing season of about 351 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 9b.
Right now the growing season is open, with about 59 days until the typical first fall frost.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Dec 16 | Dec 3 |
| 50 percent | Jan 6 | Dec 23 |
| 90 percent | Feb 4 | Jan 16 |
A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.
Soil in Sunnyvale is typically around 62°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Sunnyvale
- Radish (Cherry Belle)
- Lettuce (Buttercrunch)
- Beet (Detroit Dark Red)
- Spinach (Space)
- Swiss chard (Bright Lights)
- Kale (Lacinato)
- Bok choy (Joi Choi)
- Pea (Sugar Ann)
Timing comes from the same temperature engine the app uses, run against Sunnyvale’s normals for today.
Common questions
When is the last frost in Sunnyvale, California?
Sunnyvale’s last spring frost falls around January 6 in a typical year. One year in ten it is done by December 16, and one year in ten frost holds on until February 4. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in Sunnyvale?
The first fall frost arrives around December 23 in a typical year, as early as December 3 in an early year and as late as January 16 in a late one.
How long is the growing season in Sunnyvale?
About 351 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is Sunnyvale in?
Sunnyvale is in USDA hardiness zone 9b under the 2023 USDA Plant Hardiness Zone Map.
Dates come from 30-year NOAA climate normals for the nearest reporting station. They describe odds, not a forecast.
Nearby cities
- Santa Clara, CA (around Jan 12 to Dec 22)
- San Jose, CA (around Jan 2 to Dec 25)
- Fremont, CA (around Jan 7 to Dec 22)
- Hayward, CA (around Jan 2 to Dec 25)
- Oakland, CA (around Jan 3 to Jan 1)
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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