Round Mountain is a 5,369-foot summit on the western edge of the North Cascades in Skagit County, Washington, within the Mount Baker-Snoqualmie National Forest near Darrington. More notable than its elevation is its dramatic rise above nearby terrain: with 4,840 feet of topographic prominence, it has the greatest prominence of any peak in the county and ranks eighth in Washington. Its slopes drain into tributaries of the Stillaguamish River, and its wet, cloud-prone setting reflects the marine west coast climate of the western Cascades. The mountain is also part of a geologic landscape shaped by tectonic activity, uplift, faulting, volcanic accretion, and later Pleistocene glaciation.