The Rocky Mountains extend for approximately 3,000 miles.  

The Rocky Mountains form a vast and impressive mountain range stretching across western North America. This majestic chain extends for roughly 3,000 miles (4,800 kilometers), beginning in the northern reaches of British Columbia, Canada, and continuing southward through several U.S. states, including Montana, Idaho, Wyoming, Colorado, and New Mexico. This extensive range plays a significant role in the geography and climate of both countries