In MN in 2016, Gary Johnson had 3.8% and Evan McMullin had 1.8% of the vote, and 3.0% of the vote went to others. That's 8.6% of the vote that went to a third-party candidate. In 2012, less than 2% went to a third-party candidate, which was similar in 2008 and 2004. Kerry (04) got 51%, Obama (08) got 54%, and Obama (12) got 53% of the MN vote. Point is, MN isn't likely to turn red. People just didn't like Hillary. People don't dislike Biden in the same way. Not saying all of that 8.6% third-party vote from 2016 will go to Biden, but enough of that 8.6% will go to Biden to take MN. I personally think Biden will win MN by 5+ points (51-46 is my guess strictly based on the presidential elections from 2004 to date).
Edit to add: Trump could still win the electoral college, but I'd be shocked if he wins MN.