Mount Defiance is a mountain summit located in King County of Washington state. It's part of the Cascade Range and is within the Alpine Lakes Wilderness. Mount Defiance is situated west of Snoqualmie Pass on land managed by Mount Baker-Snoqualmie National Forest. Precipitation runoff on the mountain drains into tributaries of the Snoqualmie River. The nearest higher peak is Granite Mountain, to the east-southeast, and Bandera Mountain is to the southeast. Mount Defiance can be reached by trail, with access via the Ira Spring, Talapus Lake, or Pratt Lake trailheads.