Apex Mountain Okanogan County Washington

Apex Mountain, an 8,302-foot (2,530-meter) summit in Okanogan County, Washington, is part of the North Cascades' Okanogan Range. It lies 2.5 miles (4.0 km) south of the Canada–United States border, on the east side of the Cascade crest, within the Pasayten Wilderness and managed by the Okanogan–Wenatchee National Forest. The nearest higher peak is Amphitheater Mountain, located 2.35 miles (3.78 km) to the west-northwest. The Pacific Northwest Trail passes through Apex Pass on its northern slopes.

Precipitation runoff from the mountain drains into Cathedral Creek and Tungsten Creek, tributaries of the Chewuch River. The summit rises 1,200 feet (370 meters) above Tungsten Lake within 0.5 km (0.3 miles).

The North Cascades experience significant topographic relief due to orographic lift, with higher precipitation on the west side during winter months, primarily as snowfall. Summer months often see clear skies due to high-pressure systems over the Pacific Ocean.

Geologically, the North Cascades were formed millions of years ago by volcanic activity and tectonic processes involving the North American Plate overriding the Pacific Plate. During the Pleistocene epoch, glaciation shaped the landscape, creating U-shaped valleys and depositing rock debris. These processes combined with uplift and faulting have resulted in the area's rugged peaks and deep valleys.