Frost dates for San Bernardino, California
In a typical year, San Bernardino’s last spring frost lands around Jan 27 and the first fall frost around Dec 19, a growing season of about 326 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 10a.
Right now the growing season is open, with about 55 days until the typical first fall frost.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Dec 21 | Dec 1 |
| 50 percent | Jan 27 | Dec 19 |
| 90 percent | Feb 28 | Jan 26 |
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 San Bernardino is typically around 66°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in San Bernardino
- Bok choy (Joi Choi)
- Dill (Bouquet)
- Cauliflower (Snow Crown)
- Arugula (Astro)
- Broccoli (Green Magic)
- Mustard greens (Red Giant)
- Zucchini (Eight Ball)
- Cabbage (Red Acre)
Timing comes from the same temperature engine the app uses, run against San Bernardino’s normals for today.
Common questions
When is the last frost in San Bernardino, California?
San Bernardino’s last spring frost falls around January 27 in a typical year. One year in ten it is done by December 21, and one year in ten frost holds on until February 28. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in San Bernardino?
The first fall frost arrives around December 19 in a typical year, as early as December 1 in an early year and as late as January 26 in a late one.
How long is the growing season in San Bernardino?
About 326 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is San Bernardino in?
San Bernardino is in USDA hardiness zone 10a 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
- Fontana, CA (around Jan 9 to Dec 30)
- Moreno Valley, CA (around Jan 27 to Dec 19)
- Riverside, CA (around Jan 9 to Dec 25)
- Rancho Cucamonga, CA (around Jan 4 to Dec 30)
- Ontario, CA (around Jan 4 to Dec 30)
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