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Arapahoe Basin. What makes Arapahoe Basin delightful is also what makes it dreadful in bad weather: its elevation. Much of Arapahoe's skiing is above the tree line, and when a storm moves in, you can't tell up from down. If that sounds unpleasant, consider the other side of the coin: on sunny spring days Arapahoe is a wonderful place, because the tundra surrounded by craggy peaks is reminiscent of the Alps. Intermediate-level skiers can have a great time here on the easier trails. But A-Basin is best known for its expert challenges: the East Wall, a steep face with great powder-skiing possibilities; Pallavicini, a wide tree-lined run; and the West Wall, from which skiers of varying degrees of bravado like to launch themselves. After a long battle with the U.S. Forest Service, A-Basin won permission to install a snowmaking machine for certain trails. 28194 U.S. 6, Keystone, CO, 80435. 970/468–0718 or 888/272–7246. www.arapahoebasin.com. Late Oct.–mid-June or early July.