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Sinclair Mountain facts for kids

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Sinclair Mountain
Sinclair Mountain.jpg
Sinclair Mountain, west aspect
Highest point
Elevation 6,800+ ft (2,070+ m)
Prominence 3,600 ft (1,100 m)
Isolation 10.95 mi (17.62 km)
Sinclair Mountain is located in Alaska
Sinclair Mountain
Sinclair Mountain
Location in Alaska
Location Tongass National Forest
Haines Borough
Alaska, United States
Parent range Coast Mountains
Boundary Ranges
Topo map USGS Skagway A-1
Type of rock granite
First ascent 1973
Easiest route class 5.4

Sinclair Mountain is a prominent 6,800+ ft (2,070+ m) mountain summit located in the Boundary Ranges of the Coast Mountains, in the U.S. state of Alaska. The peak is situated 26 mi (42 km) south of Skagway, and 15 mi (24 km) north of Lions Head Mountain, on land managed by Tongass National Forest. Although modest in elevation, relief is significant since Sinclair Mountain rises 6,800 feet above the entrance to Chilkoot Inlet in 3.5 mi (6 km). The peak's name was established in 1920 by the U.S. Coast and Geodetic Survey to remember Cephas Hempstone Sinclair (1847–1920), hydrographic and geodetic engineer who had 47 years of field service with that agency. The mountain's name was officially adopted in 1920 by the U.S. Board on Geographic Names. The first ascent of this seldom climbed peak was made in mid-June 1973 by Jerry Buckley, Joe Greenough, and Craig Lingle.


Based on the Köppen climate classification, Sinclair Mountain has a subarctic climate with cold, snowy winters, and cool summers. Weather systems coming off the Gulf of Alaska are forced upwards by the Coast Mountains (orographic lift), causing heavy precipitation in the form of rainfall and snowfall. Temperatures can drop below −20 °C with wind chill factors below −30 °C. This climate supports glaciers on the north, south, and east sides of this mountain. The months May through July offer the most favorable weather for viewing or climbing Sinclair Mountain.

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