As one of Colorado’s most popular summer triathlons, Tri Boulder offers many different multisport race distances, all in one eventful day! Join us for a full day of racing at the Rez.
The very best will embark on a 140.6-mile journey that presents the ultimate test of body, mind and spirit. Through decades of stellar athlete performances, inspirational participants and emotional memories, the IRONMAN World Championship has etched a reputation as the pinnacle of the triathlon landscape and an iconic global sporting event.