Summit County, CO
| Summit County, Colorado | ||
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Summit County court house in Breckenridge
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 Location in the U.S. state of Colorado |
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 Colorado's location in the U.S. |
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| Founded | November 1, 1861 | |
| Named for | Continental Divide | |
| Seat | Breckenridge | |
| Largest town | Breckenridge | |
| Area | ||
| • Total | 619 sq mi (1,603 km2) | |
| • Land | 608 sq mi (1,575 km2) | |
| • Water | 11 sq mi (28 km2), 1.8% | |
| Population (est.) | ||
| • (2015) | 30,257 | |
| • Density | 46/sq mi (18/km²) | |
| Congressional district | 2nd | |
| Time zone | Mountain: UTC-7/-6 | |
| Website | www |
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Summit County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 27,994. The county seat is Breckenridge.
Summit County comprises the Breckenridge, CO Micropolitan Statistical Area.
Summit County was organized as one of the seventeen original Colorado counties by the First Territorial Legislature on November 1, 1861. It was named for the many mountain summits in the county. Until February 2, 1874, its boundaries included the area now comprising Summit County, Grand County, Routt County, Moffat County, Garfield County, Eagle County, and Rio Blanco County.
In 1874, the northern half of the original Summit County was split off to form Grand County; with the creation of Garfield and Eagle counties in 1883, Summit County arrived at its present boundaries. In addition, Summit County has seen two major boom eras.
According to the U.S. Census Bureau, the county has a total area of 619 square miles (1,600 km2), of which 608 square miles (1,570 km2) is land and 11 square miles (28 km2) (1.8%) is water.
The terrain of the county 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. The elevation of the county seat of Breckenridge is 9,602 feet (2,927 m), making it one the highest cities in the state of Colorado and the United States. Much of the county has an Alpine (ET in the Koppen Classification) characterized by tundra vegetation. Breckenridge and other similar elevations in the county have a Subarctic climate (Dfc) characterized by cool summers and abundant snowfall in winter.
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