Mammoth Hot Springs campground is the only (year-round) campground open in Yellowstone from late fall to spring. This campground has about 85 sites, and half of those are open in the winter. Summer time makes this campground feel quite crowded, and allows for RVs up to 75 feet, but in winter there is a tight turn that makes it only open to RVs under 30 feet. The campground is set in tiers on a hillside, so if you get a site near the top, you have an excellent view of the surrounding valley and Electric Peak.

This campground has drinking water available but no dump station. We usually haul to Billings and dump at Cabela's there, or stop at Canyon campground if heading out the East Entrance. In the off-season this campground is a very nice stay - quiet even though it is close to the road, and not usually full until spring. The town of Gardiner, MT, is only a few miles north, which offers restaurants and gas (although there is also both available in Mammoth Hot Springs). Just up the hill above the campground is the town of M. H. Springs, which is a nice place to spend time. If you are traveling with kids, be sure to stop in the awesome Visitor Center and museum. Lots of hands-on stuff to explore. Just up from the Visitor Center are the Mammoth Hot Springs Terraces, a geological feature sure to knock your socks off in any season.

For the more adventurous souls like us, you can access the Boiling River Trail to the north of the campground and jump in the river, even in the middle of winter. The Boiling River flows into the Gardner River, creating the perfect all-season hot tub. In addition to thermal features, there are tons of wildlife viewing opportunities right from the campground, especially elk, bison, and bighorn sheep.

Although not our favorite campground in the park, MHS Campground, being open all year, is an ample location to stay on your Yellowstone vacation.