Yellowstone National Park is a wonderful place to see, year-round, but winter has been called its best season—and it is truly a magical time to visit the park. To see the park in its winter glory, there are three options: cross-country skis or snow shoes, guided snowmobile tours or snowcoach touring—which is simply a tour bus designed to run, with treads, on the snow. Here is a complete list of snowcoach operators.