[2] Summit County comprises the Breckenridge, CO Micropolitan Statistical Area.

[6] Much of the county has an alpine climate (ET in the Köppen 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.

The 2019 average real estate prices in Summit County were $1,262,929 for a single family home, $559,776 for a condo, townhome or duplex and $344,945 for a vacant piece of land (YTD through December 2019).

[14] According to a report in the Journal of the American Medical Association, residents of Summit County had a 2014 life expectancy from birth of 86.83 years in 2014, the longest in the United States.

[15] Both men and women live longer in Summit County than in any other county in the United States: 85.5 years for men and 88.0 years for women is the life expectancy at birth.

[17] Colorado Mountain College operates campuses in Breckenridge and Dillon.

As of the 2020 presidential election, Summit County has not voted for the Republican candidate since 1988.