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The Aspen Skiing Company owns four mountains, all just off CO82 (which becomes Aspen’s main street): Aspen Mountain, Aspen Highlands, Buttermilk, and Snowmass. All four are connected by free shuttles and are open for skiing from around Thanksgiving to early-April. The terrain runs from smooth as glass and wide-open, above-treeline bowls to bronco-busting bumps and steep glade chutes.