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Will it freeze in Waupun in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 25°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 33°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 33°F Frost possible · Mostly Cloudy
- Fri, Nov 6 25°F Hard freeze · Mostly Clear
- Sat, Nov 7 30°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 34°F Frost possible · Partly Cloudy
- Wed, Nov 11 34°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 Waupun
The median first fall hard-freeze date (28°F) is October 22, from NOAA’s 1991–2020 Climate Normals at Town Of Westford. 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 29 · May 11 · May 25 | Sep 19 · Oct 1 · Oct 14 | 143 days |
| 32°F freeze | Apr 16 · May 1 · May 16 | Sep 27 · Oct 11 · Oct 25 | 163 days |
| 28°F hard freeze | Apr 6 · Apr 19 · May 3 | Oct 7 · Oct 22 · Nov 4 | 184 days |
Average high temperature by month
1991–2020 normals at Town Of Westford
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 Waupun, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Town Of Westford (station USC00478540, elevation 879 ft), 13 mi from Waupun. 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 Waupun
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Beaver Dam, WI | 12 mi | May 2 | Oct 9 |
| Mayville, WI | 13 mi | May 1 | Oct 10 |
| Ripon, WI | 16 mi | May 1 | Oct 11 |
| North Fond du Lac, WI | 17 mi | May 1 | Oct 12 |
| Fond du Lac, WI | 18 mi | Apr 27 | Oct 19 |
| Columbus, WI | 25 mi | Apr 30 | Oct 9 |
| Berlin, WI | 25 mi | May 1 | Oct 8 |
| Hartford, WI | 28 mi | May 8 | Oct 3 |
| Oshkosh, WI | 29 mi | Apr 24 | Oct 20 |
| Watertown, WI | 30 mi | Apr 28 | Oct 12 |
Frequently asked questions
When is the last frost in Waupun?
On average, the last spring frost (32°F) in Waupun is around May 1. In about 1 year in 10 it comes after May 16, and in 9 years in 10 it comes after April 16.
When is the first frost in Waupun?
The first fall frost (32°F) usually arrives around October 11. There’s a 10% chance of a freeze by September 27 and a 90% chance by October 25.
Can it frost in Waupun 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 11.
What growing zone is Waupun?
Waupun 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 53963. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze