When Can The Twin Ports Area Expect Our First Frost?

We're officially in autumn; and with that comes colder temperatures, and that eventual first frost. While some areas in northern Minnesota have seen frost (and even a touch of snow) already, it hasn't been widespread yet.

Historically speaking, the Duluth office of the National Weather Service says the average first date for frost (32 degree frost) in the immediate Duluth-Superior area does happen sometime between September 21 and September 30. That means we're definitely in the normal first frost window. When it comes to our first freeze (28 degree freeze), that date for the immediate Twin Ports area is usually in the first 10 days of October. You can see the full area map for average frost/freeze dates from the NWS below.

As far as when we might see our first frost this year, the NWS is saying that this Thursday and Friday night could bring a chance. After a warmer start to the week, temperatures are expected to slide, tumbling into the 30s overnight Thursday night. Friday during the day will struggle to reach 50 degrees, while Friday night will see temperatures near freezing.

This starts what looks to be the trend moving forward, with overnight temperatures of 40 degrees or colder projected every night after Thursday this week. While that doesn't bode well for those that enjoy warmer temperatures, fans of fall and fall leaves will appreciate the colder temperatures adding to the look and feel of the season.