What is the largest mountain chain in western US?

The largest mountain chain in the western United States is the Rocky Mountains. Stretching over 3,000 miles from Canada through the U.S. to New Mexico, the Rockies are known for their stunning peaks, diverse ecosystems, and recreational opportunities. This mountain range plays a significant role in the geography and climate of the region. Its highest peak, Mount Elbert, reaches an elevation of 14,440 feet in Colorado.