Big Snow Mountain is a prominent mountain summit located north of Snoqualmie Pass in the Alpine Lakes Wilderness in eastern King County of Washington state. It's part of the Cascade Range and is situated on land managed by Mount Baker-Snoqualmie National Forest. Precipitation runoff from the mountain drains into tributaries of the Snoqualmie and Skykomish Rivers. The nearest higher peak is Overcoat Peak, to the east-southeast.