IRONMAN 70.3 Boulder

Challenge yourself at altitude in one of America's most iconic endurance cities at IRONMAN 70.3 Boulder, Colorado. This legendary half-distance triathlon demands respect, with a course that leverages Boulder's high elevation, rolling terrain, and the powerful backdrop of the Rocky Mountains and Flatirons. The event tests your strength, strategy, and stamina from the first stroke in the Boulder Reservoir through the demanding bike leg out to the north and the run through the supportive city streets. Known for its fiercely passionate community of athletes and spectators, the race is built for those who truly crave the climb and the reward that comes with it. Embrace the grit and the altitude for a half-Ironman in Colorado that remains a bucket-list benchmark for triathletes worldwide, promising an unforgettable experience where the finish line feels like a summit.