Mountaineer Rumble 12 Hour

Mountaineer Rumble 12 Hour is a timed trail event held in Clover, South Carolina, on September 12, 2026. The single format is a 12-hour race in which you cover as much distance as you can before time runs out, with registration through UltraSignup.

Twelve hours is a generous window, and that is what makes this format attractive to a wide range of runners. If you are aiming for your first 50K or 50 miles, a timed race lets you get there without a cutoff hanging over you, and you can stop whenever your goal is met. Experienced ultrarunners use these events to chase distance benchmarks or as a long, controlled training day. Prepare with a 12- to 16-week block built on time on feet rather than pace, practice walking breaks, and plan a fueling schedule in the heat of a Carolina September.