Located in Colorado, the ATV trails in Boulder is known for five fun ATV trails. The best Boulder ATV trails based on popularity are considered to be Lefthand Canyon OHV Area, Apex / Kingston Peak Road, Switzerland Trail, Caribou Flats Road, and Middle Saint Vrain Road.
Northwest of Boulder and northeast of Jamestown, the Left Hand Canyon OHV Area has a great network of roads totaling over 10+ miles open to ATV riding. The very old logging roads are very challenging trails now. This area has been the site of numerous conflicts with nearby land owners so be sure to stay on public roads and KNOW where you are riding at all times.
Southeast of Winter Park, the Apex / Kingston Peak Road (FS353) is a 25 mile route open to ATV riding. The road crosses an above treeline bench at 12,000 feet with great vistas of James Peak and Longs Peak. There are some steep rocky sections.
Northwest of Boulder in the Arapaho National Forest, the Switzerland Trail (FS327) is a 8 mile route along an old railroad grade from 7700 to 9000 feet. The main trail is off Sugarloaf Mountain Road.
Northwest of Denver near Allenspark in the Arapaho National Forest, the Middle Saint Vrain Road is open to ATV riding. This four-wheel drive road is not steep, but can be very rough, with large rocks and logs. It follows Middle Saint Vrain Creek and crosses some side creeks.