South of Spearfish in the Black Hills National Forest, the Big Hill Trails is a network of five mountain biking trails totaling 10+ miles.
The mountain bike trailhead is approximately 7 miles south of Spearfish on 134 (Tinton Road).
Maintained trails on the forest are marked with blazes and brown fiberglass posts. Blazes are in the form of | either cut in the bark of pine trees or painted on redwood signs. Brown fiberglass posts are used where there are no trees.
Loops A, A.1 and B primarily meander through mixed stands of quaking aspen, paper birch and ponderosa pine.
Loops C, D and trail C.1 cross extensive stands of ponderosa pine with small patches of quaking aspen and paper birch.
Loop A 2.1 mi. Easy
Loop A.1 0.5 mi. Easy
Loop B 2.4 mi. More Difficult
Loop C 5.5 mi. More Difficult
Loop C.1** 1.5 mi. Easy
Loop D 4.5 mi. More Difficult
Overall, Big Hill Trail System is the 7th most popular mountain bike trail of all 10 mountain biking rides in South Dakota.