East of Telluride and west of Ouray, the Imogene Pass Road (aka CR K68 or Tomboy Road) is open to unlicensed dirt bikes. It is open in the west from the intersection with the Marshall Creek route to the eastern terminus at the County border.
The route starts in the west near Telluride at 9,000 feet and climbs to over 13,000 feet.
Note: Colorado residents must register their off-highway vehicle with the Colorado State Parks (303) 866-3437. Non-residents are not required to register in Colorado, if they are registered in their home states. All off-highway vehicles must have an approved muffler and spark arrester. These requirements are subject to change so make sure to contact the Colorado State Parks prior to using your off-highway vehicle.
Overall, Imogene Pass Road is the 87th most popular dirt bike trail of all 93 dirt biking rides in Colorado.