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Will it freeze in River Falls in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 31°F (Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST).
Tonight: forecast low 31°F. Freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
5 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 31°F Freeze · Mostly Cloudy
- Fri, Nov 6 26°F Hard freeze · Partly Cloudy then Areas Of Fog
- Sat, Nov 7 34°F Frost possible · Mostly Clear
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 37°F Above 36°F · Mostly Clear
- Tue, Nov 10 35°F Frost possible · Partly Cloudy
- Wed, Nov 11 37°F Above 36°F · Partly Cloudy
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 River Falls
The median first fall hard-freeze date (28°F) is October 11, from NOAA’s 1991–2020 Climate Normals at River Falls. This is the 50% probability date, not a forecast for this year.
| 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 | May 6 · May 23 · Jun 6 | Sep 8 · Sep 24 · Oct 6 | 123 days |
| 32°F freeze | Apr 26 · May 11 · May 26 | Sep 19 · Oct 1 · Oct 15 | 143 days |
| 28°F hard freeze | Apr 16 · May 1 · May 16 | Sep 27 · Oct 11 · Oct 26 | 162 days |
Average high temperature by month
1991–2020 normals at River Falls
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 River Falls, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: River Falls (station USC00477226, elevation 940 ft), 0.8 mi from River Falls. 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 River Falls
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Hudson, WI | 8.7 mi | Apr 22 | Oct 19 |
| Hastings, MN | 14 mi | Apr 23 | Oct 19 |
| Cottage Grove, MN | 14 mi | Apr 23 | Oct 19 |
| Woodbury, MN | 15 mi | Apr 26 | Oct 12 |
| Lake Elmo, MN | 16 mi | Apr 30 | Oct 11 |
| Stillwater, MN | 17 mi | Apr 30 | Oct 11 |
| St. Paul Park, MN | 18 mi | Apr 24 | Oct 16 |
| Newport, MN | 18 mi | Apr 24 | Oct 16 |
| New Richmond, WI | 19 mi | Apr 22 | Oct 19 |
| Oakdale, MN | 19 mi | Apr 26 | Oct 12 |
Frequently asked questions
When is the last frost in River Falls?
On average, the last spring frost (32°F) in River Falls is around May 11. In about 1 year in 10 it comes after May 26, and in 9 years in 10 it comes after April 26.
When is the first frost in River Falls?
The first fall frost (32°F) usually arrives around October 1. There’s a 10% chance of a freeze by September 19 and a 90% chance by October 15.
Can it frost in River Falls 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 May 23.
What growing zone is River Falls?
River Falls is in USDA Plant Hardiness Zone 4b (average annual extreme minimum temperature −25 to −20°F), based on the 2023 USDA map for ZIP code 54022. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze