Boreas Mountain is a mountain summit in Park County, Colorado, United States.
Boreas Mountain is set one-half mile east of the Continental Divide in the Front Range, which is a subrange of the Rocky Mountains. The mountain is located southeast of the community of Breckenridge and east-southeast of Boreas Pass, on land managed by Pike National Forest. Precipitation runoff from the mountain's slopes drains into tributaries of Tarryall Creek which flows to the South Platte River. Topographic relief is modest as the summit rises over in . The mountain's toponym has been officially adopted by the United States Board on Geographic Names. The mountain is named in association with Boreas Pass, which takes its name from Boreas, the Greek god of the cold north wind. Sidney Dillon applied the Boreas name to the pass.
According to the Köppen climate classification system, Boreas Mountain is located in an alpine subarctic climate zone with cold, snowy winters, and cool to warm summers. Due to its altitude, it receives precipitation all year, as snow in winter and as thunderstorms in summer, with a dry period in late spring.
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