RMRR Trophy Series

The RMRR September Trophy Series is a monthly running event held by Rocky Mountain Road Runners in Thornton, Colorado. Scheduled for September 7, 2025, it features 10k and 5k races on an out-and-back course combining paved and smooth gravel surfaces at Riverdale Ballfields. The 10k race employs a unique handicap start system, with runners starting from slowest to fastest over about 30 minutes, allowing all participants a fair chance to win based on estimated finish times.

The 5k begins approximately 15 minutes after the first 10k start. The event offers a low-key, affordable racing atmosphere with ample parking and welcomes runners of all levels. Visit the organization's website for the most recent information.