The elk rut and bugling season is at its peak over Colorado.
Estes Park and Rocky Mountain National Park have at least 200 to 600 elk wander down from the higher elevations for the mating season and is considered as one of the best spots to see the rut and hearing the bugle.
Colorado Parks and Wildlife points to the Clear Creek herd which roams in the Rocky Flats and Golden area as an alternative spot to see and hear the rut. The West Elk Wilderness just about Gunnison is also one of the best locations to hear the elk bugle, it also has 200 miles of trails to enjoy as well. Another prime spot is in West of Colorado Springs, in Mueller State Park. You can watch the rut on your own or check to see if any park programs are scheduled for a more unique experience.