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Will it freeze in San Bernardino in the next 7 nights?
No overnight lows at or below 32°F are forecast in San Bernardino during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 57°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 57°F Above 36°F · Mostly Clear
- Fri, Nov 6 57°F Above 36°F · Clear
- Sat, Nov 7 57°F Above 36°F · Clear
- Sun, Nov 8 58°F Above 36°F · Mostly Clear
- Mon, Nov 9 59°F Above 36°F · Mostly Clear
- Tue, Nov 10 58°F Above 36°F · Mostly Clear
- Wed, Nov 11 57°F Above 36°F · Slight Chance Rain Showers
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in San Bernardino
Most years have no 28°F hard freeze at Redlands, according to NOAA’s 1991–2020 Climate Normals. Check the short-term forecast above during cold snaps.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Jan 31 · Mar 2 · Apr 5 | Nov 17 · Dec 2 · Dec 19 | 272 days |
| 32°F freeze | Dec 21 · Jan 27 · Feb 28 | Dec 1 · Dec 19 · Jan 26 | 329 days |
| 28°F hard freeze | Dec 17 · Jan 7 · Feb 15 | Dec 13 · Jan 1 · Feb 13 | 365 days |
Average high temperature by month
1991–2020 normals at Redlands
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for San Bernardino, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Redlands (station USC00047306, elevation 1,410 ft), 9.2 mi from San Bernardino. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near San Bernardino
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Rialto, CA | 5.6 mi | rare | rare |
| Colton, CA | 6.2 mi | rare | rare |
| Loma Linda, CA | 7.5 mi | Jan 27 | Dec 19 |
| Highland, CA | 7.5 mi | Jan 27 | Dec 19 |
| Grand Terrace, CA | 7.5 mi | rare | rare |
| Redlands, CA | 9.3 mi | Jan 27 | Dec 19 |
| Fontana, CA | 9.9 mi | rare | rare |
| Jurupa Valley, CA | 14 mi | Jan 9 | Dec 30 |
| Riverside, CA | 15 mi | Jan 9 | Dec 25 |
| Rancho Cucamonga, CA | 16 mi | rare | rare |
Frequently asked questions
When is the last frost in San Bernardino?
On average, the last spring frost (32°F) in San Bernardino is around January 27. In about 1 year in 10 it comes after February 28, and in 9 years in 10 it comes after December 21.
When is the first frost in San Bernardino?
The first fall frost (32°F) usually arrives around December 19. There’s a 10% chance of a freeze by December 1 and a 90% chance by January 26.
Can it frost in San Bernardino after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after March 2.
What growing zone is San Bernardino?
San Bernardino is in USDA Plant Hardiness Zone 10a (average annual extreme minimum temperature 30 to 35°F), based on the 2023 USDA map for ZIP code 92405. See growing zones in California.
More: all California frost dates · California growing zones · UV index today in San Bernardino · frost vs. freeze