The 50-mile race is capped at 50 runners. The course begins and ends in Arizona, and includes several miles in the backcountry of the Valley on some very scenic, rarely seen routes, plus the iconic trail ascent of Mitchell Mesa. The 50K race is capped at 150 runners and includes spectacular trail running, highlighted again by Mitchell Mesa and the backcountry route. The Half Marathon course near Sentinel Mesa is capped at 250 runners. The Half Marathon route is primarily singletrack on some very scenic routes on the north end of the park.