Moderate. The longest trail in the park begins at the Door and Window parking area and travels five miles one way to the Fossil Exhibit Trail. Relatively level, the path passes along some badlands formations.
10 miles/16 km (round trip)
Badlands National Park has an Open Hike Policy, meaning that you are allowed to hike off-trail. As a visitor to the Badlands, you are free to explore social trails like Deer Haven, the Sage Creek Wilderness Area, or any other part of the park you can visit safely.
Deer Haven is either a short round-trip (6 mile) hike or a more extensive 23 mile loop. The trail is not marked, so navigation will rely on map/compass or GPS routing.
On the Castle Trail portion of the Medicine Root loop, the trail is almost entirely within the upper part of the Brule Formation (Poleslide Member; Oligocene Epoch, 32.0-30.0 million years ago).