Each race is run mostly on stunningly beautiful trails with a significant amount of climbing (more than 5,000 feet elevation gain for the 50K). The 25K course is on Basin Road, Perseverance Trail, Red Mill Trail, the Glory Hole overlook, Granite Creek Trail, and Mt. Roberts Trail. The 50K is essentially the 25K course, and adds the Flume and Salmon Creek Trail. The 10K is on Basin Road, Perseverance Trail, Red Mill Trail, and the Glory Hole overlook.