well just as the thread says.

 

Blackhawk Farms is the closest track to you. Several clubs hold track days there.
http://www.blackhawkfarms.com/
http://www.scca-milwaukee.org
http://www.scca-chicago.com
http://www.madisonsportscarclub.com

There is also Road America:
http://www.roadamerica.com/2006/index.htm

There is also Autobahn:
http://www.autobahncountryclub.net

For autocross there is:
http://www.madisonsportscarclub.com/autocross (Madison)
http://www.scca-milwaukee.org/Solo/solo2.html (Milwaukee)
http://waiautox.org (Milwaukee)
http://www.scca-chicago.com/solo/ (Chicago)
http://www.tsscc.org (Several WI, IL and IN sites)

 

Like Sam said. He covered most eveything.

Welcom to the Madison Area!