The Alpental ski area is located on the mountain's eastern flank.

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

[4] Most weather fronts originate in the Pacific Ocean, and 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] Because of maritime influence, snow tends to be wet and heavy, resulting in high avalanche danger.