The Castle is located in Mount Rainier National Park, and it is 0.2 mile immediately east of Pinnacle Peak.

From the saddle, a climber's path traverses the south slope of Pinnacle Peak.

[4] The Castle is located in the marine west coast climate zone of western North America.

[4] 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.