Cache Col is a gap in a high ridge between Magic Mountain and Mix-up Peak. It's located at the highest part of Cache Glacier, on the shared boundary of Skagit County and Chelan County in Washington state. Cache Col is situated south of Cascade Pass on the shared border of North Cascades National Park and Glacier Peak Wilderness. Cache Col and the Cache Glacier are at the northern end of the Ptarmigan Traverse which is mountaineering route that provides access to remote peaks such as Mount Formidable and Dome Peak. Precipitation runoff on the north side of the col drains into the Stehekin River, while precipitation drains into the Cascade River from the south side.