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Will it freeze in Caledonia in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 32°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 37°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 37°F Above 36°F · Isolated Rain Showers then Mostly Cloudy
- Fri, Nov 6 32°F Freeze · Partly Cloudy
- Sat, Nov 7 34°F Frost possible · Partly Cloudy
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 40°F Above 36°F · Mostly Clear
- Tue, Nov 10 37°F Above 36°F · Partly Cloudy
- Wed, Nov 11 39°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 Caledonia
The median first fall hard-freeze date (28°F) is November 4, from NOAA’s 1991–2020 Climate Normals at Racine Batten Airport. 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 | Apr 23 · May 7 · May 23 | Sep 30 · Oct 13 · Oct 26 | 158 days |
| 32°F freeze | Apr 11 · Apr 24 · May 10 | Oct 10 · Oct 24 · Nov 5 | 180 days |
| 28°F hard freeze | Mar 30 · Apr 11 · Apr 25 | Oct 23 · Nov 4 · Nov 17 | 205 days |
Average high temperature by month
1991–2020 normals at Racine Batten Airport
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 Caledonia, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Racine Batten Airport (station USW00094818, elevation 674 ft), 4.1 mi from Caledonia. 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 Caledonia
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Oak Creek, WI | 5.6 mi | Apr 22 | Oct 26 |
| Racine, WI | 6.2 mi | Apr 20 | Oct 24 |
| Mount Pleasant, WI | 6.2 mi | Apr 20 | Oct 24 |
| Sturtevant, WI | 6.8 mi | Apr 20 | Oct 24 |
| South Milwaukee, WI | 8.1 mi | Apr 22 | Oct 26 |
| Franklin, WI | 9.3 mi | May 3 | Oct 14 |
| Cudahy, WI | 11 mi | Apr 19 | Oct 29 |
| Somers, WI | 11 mi | Apr 28 | Oct 19 |
| Union Grove, WI | 12 mi | May 5 | Oct 8 |
| Greendale, WI | 12 mi | May 3 | Oct 14 |
Frequently asked questions
When is the last frost in Caledonia?
On average, the last spring frost (32°F) in Caledonia is around April 24. In about 1 year in 10 it comes after May 10, and in 9 years in 10 it comes after April 11.
When is the first frost in Caledonia?
The first fall frost (32°F) usually arrives around October 24. There’s a 10% chance of a freeze by October 10 and a 90% chance by November 5.
Can it frost in Caledonia 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 7.
What growing zone is Caledonia?
Caledonia is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 53402. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · UV index today in Caledonia · frost vs. freeze