If it were me, I would just keep a close eye on the web cams at
John Dee's Snow Central and decide close to the date. It is so hard to predict snows this early in the season because a couple degree change either way can mean snow or rain. I am in Central Michigan and we are under a snow advisory tonight until tomorrow mid day, but it will melt by the end of the weekend. I would bet that the NWL snowbelt of Michigan will have at least a couple rideable days during the first week or two of december, but everyone and their brother end up there. Be ready for packed trails, bars, and parking areas. We usually go up, but quit early and just drag race in the fields or at the trailheads. Im 99.9% positive that all Michigan trails open on December 1st, but the sections that go through private property might be close until after the muzzleloading deer season which is done between the 10th-20th pretty much for the whole state.