Formerly known as That Peak,[3] in 1931 The Mountaineers named it for their lawyer, Asahel Holmes Denman of Tacoma, following twenty years of work in the interests of the organization.

Denman Peak is located in the marine west coast climate zone of western North America.

[5] Most weather fronts originating in the Pacific Ocean travel northeast toward the Cascade Mountains.

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

[5] The Pinnacle Saddle Trailhead is located on the south side of the Stevens Canyon Road at Reflection Lakes.