I believe that it will vary county by county. The DNR views the snowmobile season as Dec 1 to Mar 31, but it's up to each county on when their trails open depending on snow cover, and things like hunting seasons etc.. If I remember correct there is a link on the Wisconsin DNR web site that will show trail conditions county by county and if there open or not.
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, troubleshooting, trails, maintenance, riding tips, modifications, classifieds, accessories, and more!