The northern section of Yellowstone, from the North entrance at Gardner, Montana to the Northeast entrance at Cooke City, Montana, is open to automobile traffic throughout the year. All roads in the Park are generally open from June through late October, depending upon weather conditions and/or road construction projects. Roads in the park in addition to the northern section are partially open from late April through May, late October, and the first week of November.
When open, the main roads in Yellowstone are accessible by automobiles and motor homes alike. Motor homes and otherwise oversized vehicles, however, are not allowed on many of the side roads in the park.