Mountaineer Rumble 12 Hour 2026

Mountaineer Rumble 12 Hour is a fixed-time ultrarunning race in Clover, South Carolina, with runners trying to cover as much ground as they can before the clock runs out. It is organized by Mountaineer Rumble Events, and registration is handled through UltraSignup. The available results show a small, steady race rather than a huge festival field: across eight editions, it lists 207 total finishes, with individual fields ranging from the teens to the mid-40s. Men have made up about 71% of finishers and women about 29%, and the top marks vary widely from race to race, which fits the stop-when-the-clock-ends nature of a 12-hour event.