Weather permitting, Yellowstone roads are cleared for riding -- and free of cars -- from Mammoth to Madison via Norris. On weekends, you can enter and exit from West Yellowstone. That means you could ride the full 54 miles from Gardiner to West Yellowstone (and back again if you're aching for a century ride.)
If you've never ridden in Yellowstone before the cars come, it can be a remarkable wonderland. The road from Gardiner to Cooke City is open all winter to wheeled traffic and so can be a bit busy, but this western road will only have maintenance vehicles, wildlife and you on it and the views are fabulous. This photo is from a snow coach this winter.
Be prepared to take care of your own maintenance, food and weather needs because help might be a long time coming. Otherwise, think about it. I'll be checking it out next week and will report back.
-- Nadia
