The UP is what they call it. I call it BFE. I just finished a full week of shows in the frozen tundra -- in mid-April.
I started the week at Acme in Minneapolis, MN. My trip then took me to Duluth, MN and then to Kewadin Casinos in the UP of Michigan -- St. Ignace, Sault Ste Marie and Manistique. While driving to Manistique, I saw a sign that said that the parking rest area was closed until Spring.
I guess their Spring doesn't start until June, so pack your winter coat if you plan on visiting before then.