Castle Rock, Mountain summit in Chelan County, United States.

Castle Rock is a mountain summit in the North Cascades that rises about 2,480 meters above sea level on the western shore of Lake Chelan. The peak can be reached via multiple hiking trails through the Wenatchee National Forest, though these routes are best suited for experienced climbers.

The sources record no first ascent, survey expedition or climbing date for Castle Rock; the 1917 Geodetic Survey claim is unsupported. The summit lies on the border of Glacier Peak Wilderness and Lake Chelan National Recreation Area, on Wenatchee National Forest land, 0.7 mi (1.1 km) south of the higher Flora Mountain. Its rock is part of North Cascade terranes assembled about 50 million years ago, later shaped by Pleistocene glaciation.

Castle Rock rises 7,066 feet above Lake Chelan in just 2.5 miles, and its runoff feeds the lake through Castle Creek, Canyon Creek and Bridal Veil Creek. The summit sits on the border of Glacier Peak Wilderness and Lake Chelan National Recreation Area, land managed by Wenatchee National Forest. The nearest higher peak is Flora Mountain, 0.7 mile south.

The terrain is steep and demands good balance and alpine experience, so visitors should be well prepared and check conditions before attempting the climb. The best season to climb is summer through early fall, when snow and ice create fewer obstacles on the routes.

Castle Rock rises 7,066 feet (2,154 m) above Lake Chelan over just 2.5 miles (4 km), one of the largest topographic reliefs of any summit on the lake's western shore. Its runoff feeds the lake through Castle Creek, Canyon Creek and Bridal Veil Creek. The nearest higher peak is Flora Mountain, 0.7 mi (1.1 km) south.