Keystone Resort is the largest ski resort in Summit County located in Keystone, Colorado, United States. It was founded on November 21, 1970 by Max Dercum. The resort is owned and operated by Vail Resorts which also operates three other resorts in the state (Vail, Beaver Creek, and Breckenridge) and Heavenly Ski Resort and Northstar at Tahoe at Lake Tahoe.

Keystone consists of three mountains named Dercum Mountain, North Peak, the Outback, and five Bowls (Independence, Erickson, Bergman, North and South Bowls) for skiing at every level. The first three mountains mentioned connected by a series of ski lifts and gondolas. Collectively, the mountains form the largest operation in Colorado to offer night skiing, where several trails are lit by large floodlights, and lift operation can run until late into the night. Night skiing takes place after sunset until as late as 9 p.m. on as many as 15 of the resort's trails.

Keystone is known also for its five-acre resurfaced skating lake, sleigh rides and many Zagat-rated four- and five-star restaurants. There are over 3,000 condos in Keystone, all within a short walk or free shuttle ride to one the two base areas called River Run (newest) and Mountain House (Original, less crowded).

Andreas Ygre Wiig (born March 5 1981 in Oslo, Norway) is a professional snowboarder. He rides regular.

Andreas was born in Oslo but grew up in Asker. He made a name for himself when he won two gold medals at the 2007 and 2008 Winter X Games (WXG). In the 2007 Winter X Games' Best Trick competition he went head-to-head and won against Travis Rice, who bailed during both his daring attempts at a Double Cork 1080, and in Slopestyle competition he beat Jussi Oksanen as well as four time defending Slopestyle gold medalist Shaun White, who also was in pursuit of his seventh X-Games gold medal. Wiig already had a bronze medal from WXG 2005 and a silver medal from 2006.

In the 2008 Winter X Games he again beat Shaun White for the slopestyle gold medal. White came 3rd, and Kevin Pearce finished 2nd. After this he signed a contract for $500,000 to move from sponsor Omatic snowboarding to Nitro snowboards which he left in 2009 to join Forum Snowboards. He also rides for Vans Boots and Outerwear, Electric Googles, Vestal Watches, and Rockstar Energy Drink.