Southwest of Gunnison, the popular Hartmans Rocks area has a 30+ mile network of singletrack trails and doubletrack jeep roads. The Hartman Rocks Recreation Area consists of the 160 acre Base Area managed by the City Of Gunnison and the adjacent 8,000 acres of federal land managed by the BLM. In the Spring and Fall, this area receives heavy visitation by a variety of recreationists consisting mainly of mountain bikers and dirt bikers, but also includes some hikers and horseback riders. This is a big area, so make sure to pickup a trail map before heading out.
There are three trailhead parking areas. First, there is the large northeastern Base Area off Gold Basin Road (County Road 38). Second, further down Gold Basin Road, there is the Bambi's Trailhead. Third, there is a northwestern trailhead off McCabe Lane (County Road 32).
From the large Base Area, the broad Hartmans Rocks formation is right in front of you. The trail wind up several routes through the rocks to the summit and down the back side. Continuing southwest, the trails and jeep roads wind long the broad mesa through desert sage and scrub with vistas to the south of the San Juan mountains.
To reach the Base Area trailhead for mountain biking Hartman Rocks from Gunnison, head west on US50 to Gold Basin Road. Turn left heading south on Gold Basin Road for 3 miles to the signed parking area on the right.
Overall, Hartman Rocks is the 5th most popular mountain bike trail of all 175 mountain biking rides in Colorado.