Tamanos Mountain is a 6,790-foot (2,070 m) summit located in Mount Rainier National Park in Pierce County of Washington state.

Tamanos Mountain is situated west of Governors Ridge and northeast of the Cowlitz Chimneys, all of which can be seen from the Sunrise Historic District.

[3] Topographic relief is significant as the summit rises 3,100 feet (940 meters) above the White River in approximately 1.5 mile.

Tamanos Mountain is located in the marine west coast climate zone of western North America.

As a result, the west side of the Cascades experiences high precipitation, especially during the winter months in the form of snowfall.