Eldorado Mountain is a mountain summit on the eastern flank of the Front Range of the Rocky Mountains of North America. The 8,344-foot (2,543 m) peak is located 8.1 miles (13.1 km) south by west (bearing 196°) of downtown Boulder, Colorado, United States. The mountain is largely in Boulder County but it straddles the border and its southern flanks are located in Jefferson County.