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Will it freeze in Riverside in the next 7 nights?
No overnight lows at or below 32°F are forecast in Riverside during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 56°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 56°F Above 36°F · Mostly Clear
- Fri, Nov 6 56°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 58°F Above 36°F · Mostly Clear
- Tue, Nov 10 57°F Above 36°F · Mostly Clear
- Wed, Nov 11 56°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 Riverside
Most years have no 28°F hard freeze at Riverside Fire Station 3, 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 8 · Feb 19 · Mar 22 | Nov 15 · Dec 6 · Jan 1 | 293 days |
| 32°F freeze | Dec 16 · Jan 9 · Feb 25 | Dec 1 · Dec 25 · Jan 27 | 353 days |
| 28°F hard freeze | Dec 13 · Dec 31 · Jan 16 | Nov 30 · Dec 29 · Jan 13 | 365 days |
Average high temperature by month
1991–2020 normals at Riverside Fire Station 3
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 Riverside, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Riverside Fire Station 3 (station USC00047470, elevation 840 ft), 0.9 mi from Riverside. 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 Riverside
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Jurupa Valley, CA | 6.2 mi | Jan 9 | Dec 30 |
| Grand Terrace, CA | 8.1 mi | rare | rare |
| Colton, CA | 8.7 mi | rare | rare |
| Norco, CA | 9.3 mi | Jan 17 | Dec 19 |
| Moreno Valley, CA | 11 mi | Jan 27 | Dec 19 |
| Eastvale, CA | 11 mi | Jan 17 | Dec 19 |
| Loma Linda, CA | 11 mi | Jan 27 | Dec 19 |
| Corona, CA | 11 mi | Jan 17 | Dec 19 |
| Rialto, CA | 12 mi | rare | rare |
| Fontana, CA | 12 mi | rare | rare |
Frequently asked questions
When is the last frost in Riverside?
On average, the last spring frost (32°F) in Riverside is around January 9. In about 1 year in 10 it comes after February 25, and in 9 years in 10 it comes after December 16.
When is the first frost in Riverside?
The first fall frost (32°F) usually arrives around December 25. There’s a 10% chance of a freeze by December 1 and a 90% chance by January 27.
Can it frost in Riverside 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 February 19.
What growing zone is Riverside?
Riverside 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 92506. See growing zones in California.
More: all California frost dates · California growing zones · UV index today in Riverside · frost vs. freeze