Trapper Mountain is a 7,530-foot summit in Washington’s North Cascades, southeast of Cascade Pass along the boundary between North Cascades National Park and the Glacier Peak Wilderness. Near Hurry-up Peak and draining toward Trapper Lake and the Stehekin River watershed, it rises in one of the range’s most rugged landscapes. That terrain was formed through uplift, faulting, volcanic history, and the accretion of terranes about 50 million years ago, then further sculpted by Ice Age glaciers into deep valleys and steep relief. In the marine west coast climate, Pacific storms bring heavy rain and snow, while the clearest climbing and viewing conditions usually come from July through September.