The Fraser River is a tributary of the Colorado River, approximately 40 mi (64 km) long, in north central Colorado in the United States. It drains large portion of the Middle Park basin in Grand County in the Rocky Mountains west of Boulder and southwest of Rocky Mountain National Park. It rises at the continental divide on the north side of Berthoud Pass in the Arapaho National Forest. It flows NNW past Winter Park, Fraser, and Tabernash, and joins the Colorado from the south two miles west of Granby.