State Route 186 is a 3.829-mile (6.162 km) state highway in Macon County. The western terminus of the route is at an interchange with Interstate 85 approximately 9 miles (14 km) west of Auburn. The eastern terminus of the route is at its junction with US-29/80 approximately 8 miles (13 km) east of Tuskegee.

From its origination, State Route 186 passes through the Tuskegee National Forest. The two-lane route serves as a connector route between I-85 and Phenix City and Columbus, Georgia via U.S. Highway 80.

The entire route is in Macon County.