Buckner Mountain, Mountain summit in North Cascades National Park, Washington, US

Buckner Mountain has two summits of nearly equal height, separated by a ridgeline of a few hundred feet. The southwest summit is 9,114 feet (2,778 m) according to Peakbagger.com, while the broader northeast peak is 9,112 feet (2,777 m). The mountain sits on the border of Chelan and Skagit counties, and its north face holds the Boston Glacier, the largest glacier in the North Cascades.

The mountain was named after Henry Freeland Buckner, a mining operator active in the Horseshoe Basin area in the early 1900s. His presence in the region helped establish the name that remains on maps and in climbing records today.

The name honours Henry Freeland Buckner, who managed a mining company holding claims in Horseshoe Basin southwest of the peak in the early 20th century. Climbers commonly reach the southwest summit first via the standard Horseshoe Basin route, while the northeast summit is the broader of the two.

The standard approach starts at the Cascade Pass Trailhead at the end of Cascade River Road and continues through Horseshoe Basin; most climbers reach the southwest summit first. Snow and avalanche danger persist into summer on the wet, heavy snowpack, and the Boston Glacier ice climb on the north face is a technical route. A Northwest Forest Pass is required for trailhead parking.

Buckner Mountain sits on the Chelan–Skagit county line, and Ripsaw Ridge links it west to Horseshoe Peak, Boston Peak and Sahale Mountain. The ridge marks the county border for several miles, and the whole area north of it lies under Boston Glacier, the largest glacier in the North Cascades.