Mammoth Campground is Yellowstone's only year-round campground with 85 sites located five miles south of the North Entrance, offering excellent wildlife viewing opportunities including elk, bison, and birds along the nearby Gardner River.

The campground features flush toilets, potable water, fire rings, and bear-proof food storage boxes at most tent sites, with RV sites accommodating up to 45 feet (May-October) or 30 feet (winter).

Reservations are required April 15-October 15 through Recreation. gov, while sites operate first-come, first-served October 16-April 14, with nightly fees starting at $25.