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Will it freeze in Tomah in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 29°F (Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST).
Tonight: forecast low 29°F. Freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 29°F Freeze · Mostly Cloudy
- Fri, Nov 6 22°F Hard freeze · Mostly Clear
- Sat, Nov 7 30°F Freeze · Partly Cloudy
- Sun, Nov 8 30°F Freeze · Mostly Clear
- Mon, Nov 9 35°F Frost possible · Mostly Clear
- Tue, Nov 10 32°F Freeze · Partly Cloudy
- Wed, Nov 11 33°F Frost possible · 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 Tomah
The median first fall hard-freeze date (28°F) is October 15, from NOAA’s 1991–2020 Climate Normals at Mather 3 NW. 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 5 · May 17 · Jun 1 | Sep 10 · Sep 23 · Oct 5 | 128 days |
| 32°F freeze | Apr 24 · May 6 · May 20 | Sep 19 · Oct 3 · Oct 16 | 148 days |
| 28°F hard freeze | Apr 11 · Apr 26 · May 9 | Oct 1 · Oct 15 · Oct 30 | 171 days |
Average high temperature by month
1991–2020 normals at Mather 3 NW
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 Tomah, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Mather 3 NW (station USC00475164, elevation 978 ft), 15 mi from Tomah. 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 Tomah
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Sparta, WI | 16 mi | May 9 | Oct 1 |
| West Salem, WI | 30 mi | Apr 27 | Oct 13 |
| Onalaska, WI | 35 mi | Apr 23 | Oct 17 |
| La Crosse, WI | 38 mi | Apr 27 | Oct 13 |
| Holmen, WI | 38 mi | Apr 23 | Oct 17 |
| Reedsburg, WI | 40 mi | May 2 | Oct 7 |
| La Crescent, MN | 42 mi | Apr 15 | Oct 28 |
| Wisconsin Rapids, WI | 43 mi | May 9 | Sep 30 |
| Richland Center, WI | 45 mi | May 5 | Oct 6 |
| Marshfield, WI | 50 mi | May 5 | Oct 5 |
Frequently asked questions
When is the last frost in Tomah?
On average, the last spring frost (32°F) in Tomah is around May 6. In about 1 year in 10 it comes after May 20, and in 9 years in 10 it comes after April 24.
When is the first frost in Tomah?
The first fall frost (32°F) usually arrives around October 3. There’s a 10% chance of a freeze by September 19 and a 90% chance by October 16.
Can it frost in Tomah 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 17.
What growing zone is Tomah?
Tomah 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 54660. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze