I'm with Seth on that one. Now if you want just a general idea, me and a buddy of mine know of a lonely closed 1/2 mi stretch of road. But if that'* not gonna work I think you're gonna have to wait until spring.
Here'* a website, http://minnesotadragways.com/. They have a survey you should(well all MN members should ) fill out. They were going to build a track in Owatonna but the city did something about the zoning that prevented it. Owatonna is a pretty sweet spot for a track in So. MN, right in between Mankato-Rochester-MPLS area.
According to the news page, they've already secured land, but aren't releasing the location but it'* "In the Metro area" Have to wait and see, but they're talkin about summer of 06 opening. Couldn't find that survey though.