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Will it freeze in Cedarburg in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 29°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 36°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 36°F Frost possible · Mostly Cloudy
- Fri, Nov 6 29°F Freeze · Mostly Clear
- Sat, Nov 7 33°F Frost possible · Partly Cloudy
- Sun, Nov 8 35°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 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 Cedarburg
The median first fall hard-freeze date (28°F) is November 2, from NOAA’s 1991–2020 Climate Normals at Grafton 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 20 · May 5 · May 23 | Sep 27 · Oct 11 · Oct 26 | 156 days |
| 32°F freeze | Apr 10 · Apr 23 · May 9 | Oct 8 · Oct 24 · Nov 5 | 182 days |
| 28°F hard freeze | Mar 31 · Apr 11 · Apr 24 | Oct 21 · Nov 2 · Nov 15 | 205 days |
Average high temperature by month
1991–2020 normals at Grafton 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 Cedarburg, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Grafton Wastewater Plant (station USC00473198, elevation 741 ft), 1.7 mi from Cedarburg. 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 Cedarburg
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Grafton, WI | 2.5 mi | Apr 23 | Oct 24 |
| Mequon, WI | 6.2 mi | May 6 | Oct 8 |
| Port Washington, WI | 8.1 mi | Apr 27 | Oct 22 |
| Germantown, WI | 8.1 mi | May 6 | Oct 8 |
| Brown Deer, WI | 8.7 mi | Apr 26 | Oct 18 |
| Jackson, WI | 8.7 mi | Apr 30 | Oct 15 |
| Fox Point, WI | 11 mi | Apr 26 | Oct 18 |
| Menomonee Falls, WI | 12 mi | May 6 | Oct 8 |
| Glendale, WI | 12 mi | Apr 26 | Oct 18 |
| West Bend, WI | 12 mi | May 1 | Oct 12 |
Frequently asked questions
When is the last frost in Cedarburg?
On average, the last spring frost (32°F) in Cedarburg is around April 23. In about 1 year in 10 it comes after May 9, and in 9 years in 10 it comes after April 10.
When is the first frost in Cedarburg?
The first fall frost (32°F) usually arrives around October 24. There’s a 10% chance of a freeze by October 8 and a 90% chance by November 5.
Can it frost in Cedarburg 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 5.
What growing zone is Cedarburg?
Cedarburg is in USDA Plant Hardiness Zone 5b (average annual extreme minimum temperature −15 to −10°F), based on the 2023 USDA map for ZIP code 53012. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze