That Dam Run Half Marathon
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RunDenver Series
The RunDenver Series is a multi-event winter running series produced by HAL Sports. It is described as the original running series in Colorado and has operated for over three decades. The series includes five separate community run/walk events held between December and March. Events offer on-site features such as free photos and a kids fun run of approximately 200 m at every event.
Events and key details
- Rudolph Ramble - 5K (December 7, 2025) at City Park
- Polar Bear - 5K (January 18, 2026) at Washington Park
- Super Bowl - 5K (February 1, 2026) at Washington Park
- Valentine’s Day - 4 Mile (February 8, 2026) at Washington Park
- That Dam Run - 13.1, 10K, 5K (March 1, 2026) at Cherry Creek State Park
That Dam Run courses run along Cherry Creek Dam Road and include a half marathon with a 3.5 hour course limit (16 min/mile pace). Several events list event items such as short- or long-sleeve shirts, custom finisher medals, themed swag, kids fun runs, and post-race awards. The series supports charity partners, including the Colorado Gynecologic Cancer Alliance and the Fetal Health Foundation. Registration is offered per event or for the full series. Visit the organization's website for the most recent information.