Frost dates for Concord, California
In a typical year, Concord’s last spring frost lands around Jan 9 and the first fall frost around Dec 14, a growing season of about 339 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 16 | Nov 28 |
| 50 percent | Jan 9 | Dec 14 |
| 90 percent | Feb 12 | 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 Concord is typically around 64°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Concord
- 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 Concord’s normals for today.
Common questions
When is the last frost in Concord, California?
Concord’s last spring frost falls around January 9 in a typical year. One year in ten it is done by December 16, and one year in ten frost holds on until February 12. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in Concord?
The first fall frost arrives around December 14 in a typical year, as early as November 28 in an early year and as late as January 16 in a late one.
How long is the growing season in Concord?
About 339 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is Concord in?
Concord 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)
- Berkeley, CA (around Jan 3 to Jan 1)
- Oakland, CA (around Jan 3 to Jan 1)
- Richmond, CA (around Jan 4 to Jan 2)
- Fairfield, CA (around Jan 15 to Dec 14)
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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