Frost dates · Wisconsin
When is the first frost in Green Bay?
Green Bay right now
36°FBroken cloud
- Today41°F / 34°FClouds
- Tomorrow43°F / 32°FClear skies
- Monday47°F / 30°FClear skies
Overcast and over it.
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical year, Green Bay’s first frost comes around October 9 and its last around April 30.
One year in ten the first frost comes as early as September 24, and nine years in ten it has arrived by October 26. One year in ten the last frost is over as early as April 16, and nine years in ten it is over by May 16. Green Bay averages about 152 nights a year at 32°F or colder, with about 161 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 30. That makes it the 19th earliest first frost of the 117 cities we track where it freezes most years.
Last updated
A freeze is in the forecast for the next 48 hours.
Green Bay freezes on more than 150 nights a year, and that’s just the warm-up act for the real cold.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | September 24 | October 9 | October 26 |
| Last frost | April 16 | April 30 | May 16 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Denver, Colorado: first frost around October 9
- Madison, Wisconsin: first frost around October 10
- Waterloo, Iowa: first frost around October 10
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014898.