Harbach Trailhead to Mountain Trailhead
Milepost 44.5 to milepost 49.6 or vice versa.
Harbach Park Trailhead is located in the town of Custer and starts at milepost 44.5. It goes north or south. We have done this part of the trail a couple of times. It either keeps going south to The White Elephant Trailhead at milepost 35.7 or north to the Mountain Trailhead at milepost 49.6. We find going north is a beautiful and pretty easy trail and especially nice in the fall due to all the colorful trees. Once we get to the trailhead we keep going north another 1.5 miles to hit the tunnel underneath the road to Crazy Horse. This extra mile and a half gives you some cool views of the monument. This makes the trail for hiking, biking, or running a total of around 13 miles.