The resort’s recent expansion is small but impressive. These five new trails on Andesite Mountain include Shady Chute, a 2,000-foot tree shot through 40-degree steeps, and Wolf Den, a slightly mellower 35-degree pitch. Plan your trip anytime in January, the resort’s snowiest month, when 50 to 100 inches of fresh powder typically blanket the Gallatin Range. But be sure to take a few rides up Lone Peak Tram, which tops out at 11,166 feet and provides access to 4,350 vertical feet of steeps, chutes, and thigh-burning bowls. Thankfully, Big Sky also just opened 3,000-square-foot Solace Spa and Salon, conveniently located beneath Huntley Lodge (massages from $95; bigskyresort.com). Smart Idea: A $98 ticket gets you access to Big Sky and the adjacent Moonlight Basin (moonlightbasin.com), where you can ski 60 new acres of sparsely gladed terrain. Located off the Iron Horse lift, the nine trails offer up 35-to-45-degree pitches and trails as long as a third of a mile.