Mount Constance, Mountain peak in Olympic Mountains, Washington, United States

Mount Constance is a mountain summit in the Olympic range in Washington, rising to about 2,400 meters (7,900 feet) with steep sides and jagged rock throughout. The peak stands as one of the more demanding climbs in the range due to the exposed nature of its terrain.

In 1853 surveyor George Davidson named the peak Mount Constance after Ellinor Fauntleroy's older sister, alongside Mount Ellinor and The Brothers. R. Schellin and A.E. Smith made the first recorded ascent in 1922 from the southeast. Two aircraft struck the mountain: an Army transport from McChord Field crashed 800 feet below the summit in September 1941, killing six, and in March 1975 a C-141A was cleared below safe minimums and hit the peak, killing 16.

The name comes from Ellinor Fauntleroy's older sister: surveyor George Davidson named Mount Constance, Mount Ellinor and The Brothers in 1853, the latter for her two brothers. The massif also holds Inner Constance, the twin Warrior peaks and Lake Constance in a cirque basin. The summit sits on the boundary of Olympic National Park and Buckhorn Wilderness.

Expect changeable weather at the summit as clouds and mist often roll in unexpectedly, limiting visibility during climbs. The warmer and drier months offer more stable conditions, though weather can shift rapidly even during these periods.

Mount Constance rises over 2,100 metres above the Dosewallips River in only 4.8 horizontal kilometres, and stands just 20 kilometres from the tidewater of Hood Canal. Its eastern position also keeps the treeline higher than on peaks to the west, a sign of the drier alpine conditions.