Frost dates · Minnesota
When is the first frost in Duluth?
Duluth right now
33°FClear skies
- Today37°F / 28°FClouds
- Tomorrow44°F / 25°FClouds
- Monday44°F / 29°FClear skies
Sunshine. Don't get used to it.
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical year, Duluth’s first frost comes around October 1 and its last around May 13.
One year in ten the first frost comes as early as September 18, and nine years in ten it has arrived by October 16. One year in ten the last frost is over as early as April 29, and nine years in ten it is over by May 29. Duluth averages about 177 nights a year at 32°F or colder, with about 140 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around May 13. That makes it the 11th 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.
Duluth gets frost into mid-May and back by October, and Lake Superior takes full credit for both.
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 18 | October 1 | October 16 |
| Last frost | April 29 | May 13 | May 29 |
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
- Anchorage, Alaska: first frost around October 1
- Cheyenne, Wyoming: first frost around October 1
- Rapid City, South Dakota: first frost around October 1
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014913.