Big Hill was named when the early prospectors, heading to gold fields with wagons and teams of horses, could barely make it over the "Big Hill" when coming from Spearfish.
| Difficulty | Easy to Difficult |
| Length | Varies | 13.6 total miles |
| Elevation | 5,000 to 5,480 feet |
| Directions | From Spearfish, take FSR 134 south approximately 8 miles to the trailhead. |
Loops A, A-1, and B primarily meander through mixed stands of quaking aspen, paper birch, and ponderosa pine. Loops C and D cross extensive stands of ponderosa pine with small patches of quaking aspen and paper birch. Spur D-1 accesses a scenic overlook of Spearfish Canyon and Spearfish Mountain. Trails are marked with blue diamonds.
During the winter season, trails A1, A, D, and C are groomed for cross-country skiing in cooperation with the Black Hills Nordic Ski Club.
