Keystone Resort is a premier year-round mountain destination located in Summit County, Colorado. Operated by Vail Resorts, it is renowned for its extensive winter sports terrain and diverse summer activities, making it a major hub for recreation in the Rocky Mountains.

The resort is celebrated for its expansive ski area, which encompasses three distinct mountains: Dercum Mountain, North Peak, and The Outback. This configuration offers a wide variety of terrain suitable for all skill levels, from gentle beginner slopes to challenging expert bowls and tree skiing. Keystone is notable for having one of the largest night skiing operations in the United States, allowing guests to enjoy the slopes after sunset on a significant portion of Dercum Mountain.

Beyond alpine skiing and snowboarding, the winter season features a renowned terrain park, cross-country skiing, snowshoeing, and snow tubing. The resort's Snowcat skiing operation provides access to additional high-alpine, guided terrain for advanced skiers and riders seeking untouched powder.

During the warmer months, Keystone transforms into an adventure center. The resort's extensive trail network becomes ideal for mountain biking and hiking, with lift-served access available for bikes. Other summer activities include scenic gondola rides, disc golf, fishing in the resort's lakes, and an array of family-friendly events and festivals held in the base village areas.

The resort's infrastructure includes multiple base villages—River Run, Lakeside Village, and Mountain House—which offer a variety of lodging, dining, shopping, and entertainment options. A hallmark of the guest experience is the pedestrian-friendly layout and the availability of complimentary shuttle services connecting the villages, parking areas, and activity centers.

Keystone Resort places a strong emphasis on family-oriented programming and environmental sustainability initiatives. Its location provides relatively convenient access from Denver, contributing to its popularity as a destination for both regional visitors and international travelers seeking a comprehensive mountain resort experience in Colorado.