Frost dates for Fairfield, California
In a typical year, Fairfield’s last spring frost lands around Jan 15 and the first fall frost around Dec 14, a growing season of about 333 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 50 days until the typical first fall frost.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Dec 22 | Nov 29 |
| 50 percent | Jan 15 | Dec 14 |
| 90 percent | Feb 16 | Jan 9 |
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 Fairfield is typically around 63°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Fairfield
- Radish (Cherry Belle)
- Spinach (Space)
- Lettuce (Black Seeded Simpson)
- Swiss chard (Fordhook Giant)
- Dill (Bouquet)
- Turnip (Purple Top White Globe)
- Arugula (Astro)
- Mustard greens (Red Giant)
Timing comes from the same temperature engine the app uses, run against Fairfield’s normals for today.
Common questions
When is the last frost in Fairfield, California?
Fairfield’s last spring frost falls around January 15 in a typical year. One year in ten it is done by December 22, and one year in ten frost holds on until February 16. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in Fairfield?
The first fall frost arrives around December 14 in a typical year, as early as November 29 in an early year and as late as January 9 in a late one.
How long is the growing season in Fairfield?
About 333 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is Fairfield in?
Fairfield 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)
- Concord, CA (around Jan 9 to Dec 14)
- Richmond, CA (around Jan 4 to Jan 2)
- Berkeley, CA (around Jan 3 to Jan 1)
- 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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