Weather
Minnesota-Wisconsin Weather: Frost Advisory Through Monday
Duluth, Minnesota – The National Weather Service in Duluth has issued a frost advisory covering a broad stretch of northern Minnesota and northwest Wisconsin,…
By Mason Reid · 2026-09-13T19:02:08.960Z
Duluth, Minnesota – The National Weather Service in Duluth has issued a frost advisory covering a broad stretch of northern Minnesota and northwest Wisconsin, effective from midnight tonight, Sunday, September 13, 2026, until 8 a.m. CDT on Monday, September 14, 2026. The advisory warns that temperatures reaching as low as 33 to 35 degrees will result in frost formation across the region, posing a potential risk to sensitive outdoor vegetation.
According to the National Weather Service, the frost conditions are expected to impact multiple counties. In Minnesota, the affected areas include South Itasca, Northern Aitkin, Carlton, South St. Louis, Koochiching, North Itasca, Central St. Louis, North St. Louis, and Northern Cook and Lake counties. Specific cities included in these zones are Grand Rapids, Duluth, Hinckley, Pine City, Hill City, Bigfork, Hibbing, Ely, and International Falls. In Wisconsin, the advisory encompasses Burnett, Douglas, Bayfield, Ashland, Iron, Washburn, Sawyer, and Price counties, including the cities of Grantsburg, Ashland, Hurley, Washburn, Bayfield, Phillips, Spooner, Hayward, and Superior.
Meteorologists note that the potential for frost varies by geography. Areas inland from Lake Superior carry the greatest risk of frost formation tonight, particularly in the southern portions of Douglas and Bayfield counties. Conversely, areas immediately around Superior are considered less likely to experience frost. In several typical colder spots across inland northwest Wisconsin and northern Minnesota, temperatures may drop to around or slightly below freezing for a period of a couple hours around sunrise on Monday, September 14, 2026.
The impact of this weather event is primarily centered on outdoor greenery. Officials caution that frost could harm sensitive outdoor vegetation, and plants left uncovered face the risk of being killed by the cold. Residents are urged to take necessary steps now to protect tender plants from the anticipated cold temperatures before the advisory period begins at midnight tonight.
For further information on Northland weather conditions, residents are encouraged to visit the official website at www.weather.gov/duluth. Staying informed throughout the night is recommended for those with significant investments in sensitive landscaping or gardens.
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