Keystone, Colorado

Keystone Resort was originally constructed by the Ralston Purina Company in the 1970s, and is now owned by Vail Resorts. The Keystone Resort ski area offers 117 ski runs spaning 3 different world-class ski mountains with the only night skiing in the area. Keystone offers several summer and winter outdoor activities including skiing, snowboarding, ice-skating, cross-country skiing, dog sleigh, and snowmobiling. Summer activities include hiking, biking and fishing.

Base elevation: 9,280 feet (2,830 m) Summit elevation: 12,408 feet (3,782 m)

Keystone is the closest major resort to the Denver International Airport and is only a 20 minute drive from Breckenridge and Copper Mountain Resorts.