[1] Precipitation runoff and glacial meltwater from the mountain's slopes drains to Kenai Lake via the Snow River.

Although modest in elevation, topographic relief is significant as the summit rises 5,380 feet (1,640 m) above the South Fork Snow River in 2 miles (3.2 km).

[3] The mountain's toponym has not been officially adopted by the United States Board on Geographic Names.

Based on the Köppen climate classification, Hearth Mountain is located in a tundra climate zone with long, cold, snowy winters, and mild summers.

[4] Weather systems coming off the Gulf of Alaska are forced upwards by the Kenai Mountains (orographic lift), causing heavy precipitation in the form of rainfall and snowfall.