Mount Rahm is an 8,486-foot peak in the northern North Cascades National Park in Washington, near the Canada–United States border at the northeastern end of Custer Ridge. Named for author and professor Dr. David Allan Rahm, whose work focused on the region’s geology, it stands in a landscape shaped by tectonic accretion, igneous activity, uplift, faulting, and repeated Pleistocene glaciation. The mountain is also associated with the extinct Mount Rahm Caldera and may once have been a subsidiary stratovolcano of that volcanic system. In the marine west coast climate of the western North Cascades, heavy winter precipitation and dense snowfall are common, while clearer summer weather makes July through September the best time to view or climb it.