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Will it freeze in Beaver Dam in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 26°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 34°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
6 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 34°F Frost possible · Mostly Cloudy
- Fri, Nov 6 26°F Hard freeze · Mostly Clear
- Sat, Nov 7 31°F Freeze · Partly Cloudy
- Sun, Nov 8 32°F Freeze · Mostly Clear
- Mon, Nov 9 38°F Above 36°F · Mostly Clear
- Tue, Nov 10 35°F Frost possible · Partly Cloudy
- Wed, Nov 11 35°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 Beaver Dam
The median first fall hard-freeze date (28°F) is October 20, from NOAA’s 1991–2020 Climate Normals at Beaver Dam Wastewater Plant. 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 30 · May 13 · May 27 | Sep 18 · Sep 29 · Oct 12 | 138 days |
| 32°F freeze | Apr 19 · May 2 · May 16 | Sep 25 · Oct 9 · Oct 23 | 157 days |
| 28°F hard freeze | Apr 7 · Apr 22 · May 6 | Oct 5 · Oct 20 · Nov 3 | 180 days |
Average high temperature by month
1991–2020 normals at Beaver Dam Wastewater Plant
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 Beaver Dam, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Beaver Dam Wastewater Plant (station USC00470645, elevation 861 ft), 2.4 mi from Beaver Dam. 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 Beaver Dam
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Waupun, WI | 12 mi | May 1 | Oct 11 |
| Columbus, WI | 14 mi | Apr 30 | Oct 9 |
| Mayville, WI | 14 mi | May 1 | Oct 10 |
| Watertown, WI | 21 mi | Apr 28 | Oct 12 |
| Hartford, WI | 25 mi | May 8 | Oct 3 |
| Ripon, WI | 25 mi | May 1 | Oct 11 |
| Lake Mills, WI | 28 mi | Apr 29 | Oct 14 |
| Windsor, WI | 28 mi | May 4 | Oct 6 |
| Fond du Lac, WI | 28 mi | Apr 27 | Oct 19 |
| North Fond du Lac, WI | 29 mi | May 1 | Oct 12 |
Frequently asked questions
When is the last frost in Beaver Dam?
On average, the last spring frost (32°F) in Beaver Dam is around May 2. In about 1 year in 10 it comes after May 16, and in 9 years in 10 it comes after April 19.
When is the first frost in Beaver Dam?
The first fall frost (32°F) usually arrives around October 9. There’s a 10% chance of a freeze by September 25 and a 90% chance by October 23.
Can it frost in Beaver Dam 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 13.
What growing zone is Beaver Dam?
Beaver Dam is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 53916. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze