Coast Ranges, mountains in the western United States. They extend along the Pacific coast for more than 1,000 miles (1,600 km), running through Washington, Oregon, and California. The Coast Ranges include the Olympic Mountains in Washington, the Oregon Coast Range, the Klamath Mountains on the Oregon-California border, and numerous low ranges in California.

The mountains are up to 50 miles (80 km) wide. They are continuous except for gaps made by San Francisco Bay and the Columbia River. Altitudes vary from about 2,000 to 9,000 feet (600 to 2,700 m). California's Central Valley and the Puget Sound-Willamette Valley, which runs through Washington and Oregon, border the mountains on the east. The Coast Ranges are noted for their vast timber resources, primarily Douglas fir in Washington and Oregon and towering redwoods in northern California. Many of the valleys are leading fruit and vegetable sources.