Summit County is located among the high peaks of the Colorado Rockies, immediately west of the Continental Divide. Our elevation ranges from a low of 7,947 feet above sea level at Green Mountain Reservoir to a 14,270 feet at Gray’s Peak.
Our dry, high-alpine climate yields long, snowy winters that have attracted world-class ski resorts. We have pleasantly warm summers that are ideal for hiking, biking, fishing, backpacking, kayaking and other forms of recreation.
Summit County is centrally located in Colorado, only an hour’s drive from the Denver metropolitan area via Interstate 70, the state’s main east-west transportation corridor.
Towns, Resorts & Federal Lands
Included within the county are six municipalities (Blue River, Breckenridge, Dillon, Frisco, Montezuma, and Silverthorne), four major ski areas (Arapahoe Basin, Breckenridge, Copper Mountain, and Keystone), portions of the White River National Forest, some Bureau of Land Management lands, and two Congressionally designated wilderness areas (Eagles Nest and Ptarmigan Peak). About 80% of the land in the county is federal public land.
Several striking mountain ranges converge in the county, including portions of the Gore Range, the Tenmile Range, and the Front Range.
Among Summit’s impressive features is the Blue River, generating three times the flow of any other tributary in the Colorado River Basin. The Blue River and its primary tributaries, the Snake River and Tenmile Creek, define the county’s contours, cutting deep valleys into the mountainous terrain.
In the early 1960s, the Denver Water Board dammed the Blue River to create the 2,790-acre Dillon Reservoir, now a popular site for summer recreation. Green Mountain Reservoir, just north of Silverthorne, uses the Blue River to generate power and provide irrigation to nearby ranchlands.
Summit has four awesome resorts offering outdoor fun in the summer and an incredible 7 month season of skiing and snowboarding!
The cool neighborhoods of Frisco, Dillon, and Silverthorne all offer unique dining, shopping, and outdoor fun.
Organized as one of the original Colorado counties, Summit has a total area of 619 square miles (1,600 km2) and about 80% is public land. Terrain is mountainous with elevations ranging from 7,957 feet (2,425 m) at Green Mountain Reservoir to 14,270 feet (4,350 m) at Grays Peak. Come find out why people live longer here than in any other county in the United States. Explore Summit.