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Will it freeze in St. Francis in the next 7 nights?
No overnight lows at or below 32°F are forecast in St. Francis during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 39°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 39°F Above 36°F · Isolated Rain Showers then Mostly Cloudy
- Fri, Nov 6 34°F Frost possible · Partly Cloudy
- Sat, Nov 7 36°F Frost possible · Partly Cloudy
- Sun, Nov 8 40°F Above 36°F · Mostly Clear
- Mon, Nov 9 44°F Above 36°F · Mostly Clear
- Tue, Nov 10 42°F Above 36°F · Partly Cloudy
- Wed, Nov 11 42°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 St. Francis
The median first fall hard-freeze date (28°F) is November 8, from NOAA’s 1991–2020 Climate Normals at Milwaukee Mitchell Airport. 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 18 · May 1 · May 15 | Oct 5 · Oct 18 · Oct 30 | 168 days |
| 32°F freeze | Apr 6 · Apr 19 · May 2 | Oct 15 · Oct 29 · Nov 10 | 192 days |
| 28°F hard freeze | Mar 24 · Apr 6 · Apr 20 | Oct 27 · Nov 8 · Nov 22 | 215 days |
Average high temperature by month
1991–2020 normals at Milwaukee Mitchell Airport
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 St. Francis, WI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Milwaukee Mitchell Airport (station USW00014839, elevation 670 ft), 2.0 mi from St. Francis. 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 St. Francis
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Cudahy, WI | 1.9 mi | Apr 19 | Oct 29 |
| South Milwaukee, WI | 4.3 mi | Apr 22 | Oct 26 |
| Oak Creek, WI | 6.2 mi | Apr 22 | Oct 26 |
| Greenfield, WI | 6.8 mi | May 3 | Oct 14 |
| Greendale, WI | 6.8 mi | May 3 | Oct 14 |
| Milwaukee, WI | 8.1 mi | Apr 26 | Oct 18 |
| West Allis, WI | 8.1 mi | Apr 26 | Oct 22 |
| Shorewood, WI | 8.1 mi | Apr 26 | Oct 18 |
| Hales Corners, WI | 9.3 mi | May 3 | Oct 14 |
| Franklin, WI | 9.3 mi | May 3 | Oct 14 |
Frequently asked questions
When is the last frost in St. Francis?
On average, the last spring frost (32°F) in St. Francis is around April 19. In about 1 year in 10 it comes after May 2, and in 9 years in 10 it comes after April 6.
When is the first frost in St. Francis?
The first fall frost (32°F) usually arrives around October 29. There’s a 10% chance of a freeze by October 15 and a 90% chance by November 10.
Can it frost in St. Francis 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 1.
What growing zone is St. Francis?
St. Francis is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 53235. See growing zones in Wisconsin.
More: all Wisconsin frost dates · Wisconsin growing zones · frost vs. freeze