Whetstone Mountain, elevation 12,527 ft (3,818 m), is a summit in the Gunnison National Forest of western Colorado.

The mountain is located 3 mi (4.8 km) south of Crested Butte in Gunnison County.

Whetstone Mountain is a laccolith, formed when magma intruded into sedimentary strata of Mancos Shale and the Mesaverde Formation approximately 30 million years ago.

[5][6] The mountain's name stems from rock collected in the area by the Hayden Survey during the early 1870s.

Whetstones (also called hornfels) are contact metamorphic rocks useful for sharpening tools.