Mount Custer (8,888 feet (2,709 m)) is a mountain in the Livingston Range, Glacier National Park in the U.S. state of Montana.

[3] Situated along the Continental Divide, Mount Custer rises more than 3,300 feet (1,000 m) above Lake Nooney, located below the summit to the east.

Like other mountains in Glacier National Park, Mount Custer is composed of sedimentary rock laid down during the Precambrian to Jurassic periods.

Formed in shallow seas, this sedimentary rock was initially uplifted beginning 170 million years ago when the Lewis Overthrust fault pushed an enormous slab of precambrian rocks 3 mi (4.8 km) thick, 50 miles (80 km) wide and 160 miles (260 km) long over younger rock of the cretaceous period.

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