Southwest of Denver and west of Bailey in the Pike National Forest, there is a scenic dirt road, Twin Cone Road (aka FS 126) heading south along the ridge from Kenosha Pass for about 10 miles. It is open to ATV riding.
To reach the Kenosha Pass ATV riding trailhead from Denver, head west on US285 for 58 miles to the signed Kenosha Pass. Turn left heading south on FS126 for 0.25 miles to the signed parking area. Continue riding south on Twin Cone Road (FS126).
Note: Colorado residents must register their off-highway vehicle with the Colorado State Parks (303) 866-3437. Out-of-state residents who bring OHVs into Colorado must purchase a Colorado Non-Resident OHV permit which is valid from the date of purchase through the following March 31. These permits can be purchased anywhere you get your hunting/fishing licenses in Colorado. 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, Kenosha Pass - Twin Cone Road is the 73rd most popular ATV riding trail of all 90 ATV trails in Colorado.