Frost dates for Santa Rosa, California
In a typical year, Santa Rosa’s last spring frost lands around Feb 25 and the first fall frost around Dec 1, a growing season of about 279 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 37 days until the typical first fall frost.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Jan 21 | Nov 10 |
| 50 percent | Feb 25 | Dec 1 |
| 90 percent | Mar 29 | Dec 24 |
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 Santa Rosa 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 Santa Rosa
- Radish (Cherry Belle)
- Garlic (Music)
- Shallot (French Red Shallot)
- Bok choy (Toy Choi)
- Arugula (Surrey)
Timing comes from the same temperature engine the app uses, run against Santa Rosa’s normals for today.
Common questions
When is the last frost in Santa Rosa, California?
Santa Rosa’s last spring frost falls around February 25 in a typical year. One year in ten it is done by January 21, and one year in ten frost holds on until March 29. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in Santa Rosa?
The first fall frost arrives around December 1 in a typical year, as early as November 10 in an early year and as late as December 24 in a late one.
How long is the growing season in Santa Rosa?
About 279 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is Santa Rosa in?
Santa Rosa 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
- Vallejo, CA (around Jan 17 to Dec 27)
- Fairfield, CA (around Jan 15 to Dec 14)
- Richmond, CA (around Jan 4 to Jan 2)
- Berkeley, CA (around Jan 3 to Jan 1)
- San Francisco, CA (around Dec 30 to Dec 25)
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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