Yellowstone National Park has seasonal road closures and openings so be sure you're up to date on the road status before you book your trip.
Yellowstone National Park Entrance AccessThroughout the winter, four out of five of the Yellowstone National Park entrances are closed to vehicles; however, they are open to snow travel (snowmobiling and snowcoach tours). The North Yellowstone entrance is the only location that is open year-round for vehicle travel. The only months where you can enjoy all of the Yellowstone adventures as well as having access to the public facilities and services, are between July and August.
Depending on the weather and road maintenance, a few areas open in April, with a large amount opening up to the public in May or June. October and September are generally the fall months where roads, facilities and services begin to close for the winter season.