Pinnacle Mountain is an granitic multi-peak massif located in the Chelan Mountains, in Chelan County of Washington state. The mountain is situated in Glacier Peak Wilderness of the North Cascades, on land managed by Wenatchee National Forest. Fred Beckey's Cascade Alpine Guide has the elevation of the highest pinnacle as 8,402 feet. Pinnacle Mountain ranks as the fourth-highest peak in the Chelan Mountains, and 75th-highest summit in Washington state. Its nearest higher neighbor is Saska Peak, to the southeast, and Emerald Peak is positioned to the east-southeast. Precipitation runoff from the peak drains into the Entiat River and Chelan River drainage basins.