The NPS is waiving entrance fees on 9 days in 2015 as a way to encourage people to get outdoors and enjoy the remarkable landscapes and historical and cultural sites national parks have to offer.

Fee free dates for 2015 are:

- January 19 to celebrate Martin Luther King Jr. Day
- February 14-16 for the Presidents' Day Weekend
- April 18-19 for the opening weekend of National Park Week
- August 25 for the National Park Service's 99th birthday
- September 26 for National Public Lands Day
- November 11 in honor of Veterans Day

The road from the North Entrance at Gardiner, Mont., through Mammoth Hot Springs on to Cooke City, Mont., outside the park's Northeast Entrance, is open to wheeled vehicle travel all year. Access to the interior of Yellowstone and iconic locations like Old Faithful and the Grand Canyon of the Yellowstone is restricted to guided snowmobile and snowcoach trips from the North, West, South, and East entrances during the winter months.

At Old Faithful, the Old Faithful Snow Lodge and Cabins and the dining room, the Geyser Grill, the Bear Den Gift Shop and the Old Faithful Visitor Education Center are all open for the winter season. At Mammoth Hot Springs, the hotel, dining room and gift shop are open for the winter season. The Yellowstone General Store, medical clinic, campground, post office, and the Visitor Center are open all year. Fuel is available from 24-hour gasoline pumps all year at both Mammoth Hot Springs and Tower Junction.