Yellowstone National Park is a place of otherworldly wonders. Perched atop a behemoth supervolcano, the country’s first national park boasts geothermal marvels—from spouting geysers and sizzling fumaroles to rainbow-hued mudpots—alongside dramatic canyons and tumbling waterfalls. Charismatic megafauna, including bison, wolves and elk, roam freely. In the summer, Yellowstone teems with tourists. The park counts about 4 million visits per year, with more than half of these occurring in June, July and August. Winter, though, is an unsung gem of a season. As snow blankets the ground, crowds thin. Shaggy-haired bison lumber through the drifts—their beards crusted with icicles. (That big hump on a bison’s back? It’s muscle, allowing the animal to use its head as a snowplow.) Waterfalls freeze solid; geysers erupt into the frosty air; and the park’s iconic wolves, having traveled down from the high country, are at their most visible. The beauty and serenity are unmatched.

Of Yellowstone’s five entrances, only the north gate, with its iconic Roosevelt Arch, remains open year-round. Consider posting up in Gardiner, Montana, a tiny charmer of a town with abundant lodging options just outside the park boundaries. Within the park, all unplowed roads and trails are open to skiers and snowshoers, but be prepared to push through untouched powder, as only a few miles of track are set. Plan to adjust your route if, say, you round the corner and come upon a herd of bison. Weighing up to one ton and capable of hitting 40 mph, the impressive ungulates are America’s largest land mammal and have injured more people in Yellowstone than any other animal. In other words, keep your distance.

Skiers and snowshoers setting out on their own will want to stop by the Albright Visitor Center for trail maps and condition updates. Some years, rangers lead guided snowshoe walks along the travertine terraces of Mammoth Hot Springs, where sulfur-scented steam rises from the winter white. Dozens of outfitters in the region also offer guided skiing and snowshoeing tours; find a list on the park’s website. Venture to Old Faithful, or the Grand Canyon of the Yellowstone on a snowcoach—a multi-passenger vehicle kitted out with huge low-pressure tires or snow tracks. Note: Yellowstone experienced catastrophic flooding in June 2022 and recovery remains underway. Check for potential road closures before setting out at nps.gov.

Halfway between Yellowstone and Boise sits another spectacular spot, where lava eruptions during the past 15,000 years have left behind vast jet-black fields of basalt alongside dozens of cinder cones. In the 1924 proclamation that made Craters of the Moon a national monument, President Calvin Coolidge called its phenomena “curious and unusual.” He described the landscape as “weird and scenic.” In 1969, Apollo astronauts trained here for lunar geology missions, and NASA continues to perform research in this remote patch of Idaho.

At 5,900 feet, winter arrives early here and brings a high-contrast scene, with bits of jagged black rock breaking through a pristine white sweep of snow. The monument’s only paved road, a scenic 7-mile loop, becomes a regularly groomed track for skiers and snowshoers. It’s relatively level, with just a few gentle hills; ski it clockwise to avoid the somewhat steep descent on the southwest flank of Inferno Cone. Skiers are also allowed to venture onto the open slopes of the cinder cones located along the Loop Road, where telemarking terrain awaits. Before carving some turns, check for evidence of other travelers. Though Craters of the Moon doesn’t boast the megafauna of Yellowstone, you might spot the delicate tracks of species ranging from deer mice and snowshoe hares to coyotes and bobcats. Stay alert, too, for the sharp “kraak” of the Clark’s nutcracker, one of the birds that toughs it out year-round.