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IRONMAN 70.3 Boulder

June 8, 2024

IRONMAN 70.3 Boulder is more than just a "half" IRONMAN. It's a cherished experience at the foot of the Rockies in one of America's hubs for elite athletes.

Nestled at the foot of the stunning Flatirons, Boulder, Colorado, is already a wildly popular home-base and vacation destination for world-class triathletes. The city's health-conscious culture, near-perfect weather and breathtaking natural environment make it a favorite on the IRONMAN circuit. 

The 70.3 offers athletes the chance to focus on their performance and prep for future full IRONMAN opportunities.

2024 Hotel Reservations

Stay in Boulder and maximize your pre- and post-race time, and arrive to the start line fresher. View the IRONMAN 70.3 Boulder hotel options here.

IRONMAN 70.3 Boulder 2024 Event Information

2024 race information is to be announced.

Typically, the race starts at the Boulder Reservoir with a single-loop swim. Once finished in the water, the first transition will start the athletes on a beautiful one-loop bike course all contained in Boulder County, with 2,000 feet of elevation gain. The two-loop run course tends to be very fast with minimal elevation gain. In past years, most of the course is on dirt roads.

For more information, visit the official IRONMAN 70.3 Boulder website.

For details on the IRONMAN Foundation’s Humanitarian Relief efforts, and how to donate, purchase t-shirts, or volunteer, go to the foundation's website.