Ninety-one percent of the park's 3,472 square miles are in Wyoming, 7.6 percent in Montana, and 1.4 percent in Idaho. Near the gateway community of Gardiner, Montana, the North Entrance is the only park entrance open to wheeled vehicles all year. November through April, the North Entrance provides the only access to Cooke City, Montana. Beyond Cooke City the road is closed to wheeled vehicles November through April. The road from Mammoth to Norris is open to wheeled vehicles from the third Friday in April through the first Sunday in November, and to tracked oversnow vehicles from the third Wednesday in December to Monday of the first full week in March.
Services are available year around.
Adjacent to the town of West Yellowstone, Montana, the West Entrance is open to wheeled vehicles from the third Friday in April through the first Sunday in November, and to tracked oversnow vehicles from the third Wednesday in December to Monday of the second full week in March. Services are available year around. Open to wheeled vehicles from the first Friday of May through the first Sunday in November, and to tracked oversnow vehicles from the third Wednesday in December to Monday of the second full week in March. Limited services are available near the South and East Entrances. See our Road Construction Page for information about possible delays.