It must get cold in Montana - I've never seen a hotel advertise this as an amenity before!
This morning we drove an hour south of Livingston to the north Yellowstone entrance, and I hopped out to take a pic of the line of cars waiting to pay $35 each to enter the park. We only spent a few hours traversing the northeast corner of Yellowstone with intermittent thundershowers and hail, so we avoided much of the crowds. It also meant we missed seeing Old Faithful and other geysers (guess we will need to return someday!).