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Will it freeze in Baraboo 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.
5 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 33°F Frost possible · Mostly Clear
- Sun, Nov 8 34°F Frost possible · Clear
- Mon, Nov 9 39°F Above 36°F · Mostly Clear
- Tue, Nov 10 36°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 Baraboo
The median first fall hard-freeze date (28°F) is October 17, from NOAA’s 1991–2020 Climate Normals at Baraboo. 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 2 · May 18 · Jun 1 | Sep 11 · Sep 26 · Oct 7 | 131 days |
| 32°F freeze | Apr 21 · May 5 · May 21 | Sep 22 · Oct 5 · Oct 19 | 152 days |
| 28°F hard freeze | Apr 10 · Apr 24 · May 9 | Oct 1 · Oct 17 · Nov 1 | 174 days |
Average high temperature by month
1991–2020 normals at Baraboo
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 Baraboo, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Baraboo (station USC00470516, elevation 823 ft), 0.9 mi from Baraboo. 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 Baraboo
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Reedsburg, WI | 14 mi | May 2 | Oct 7 |
| Portage, WI | 15 mi | Apr 28 | Oct 10 |
| Waunakee, WI | 25 mi | May 1 | Oct 10 |
| DeForest, WI | 25 mi | May 4 | Oct 6 |
| Middleton, WI | 27 mi | Apr 28 | Oct 15 |
| Windsor, WI | 27 mi | May 4 | Oct 6 |
| Madison, WI | 30 mi | May 1 | Oct 9 |
| Mount Horeb, WI | 32 mi | May 7 | Oct 1 |
| Sun Prairie, WI | 32 mi | May 1 | Oct 10 |
| Richland Center, WI | 34 mi | May 5 | Oct 6 |
Frequently asked questions
When is the last frost in Baraboo?
On average, the last spring frost (32°F) in Baraboo is around May 5. In about 1 year in 10 it comes after May 21, and in 9 years in 10 it comes after April 21.
When is the first frost in Baraboo?
The first fall frost (32°F) usually arrives around October 5. There’s a 10% chance of a freeze by September 22 and a 90% chance by October 19.
Can it frost in Baraboo 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 18.
What growing zone is Baraboo?
Baraboo 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 53913. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze