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IRONMAN 70.3 Boulder

June 10, 2023

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.

2023 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 2023 Event Information

The 2023 race will start 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 through the rolling hills of Boulder County, with 2,059 feet of elevation gain.

The two-loop, 13.1-mile running course will take athletes along the Boulder Reservoir, Coot Lake and Sixmile Reservoir, mostly on dirt gravel roads. Spectators will have multiple opportunities to cheer on the athletes for a triumphant finish.

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

Course Map

View the IRONMAN website for interactive course maps.

Ironman Support for Ukrainian Humanitarian Relief

The IRONMAN Foundation is kicking off a Ukrainian Humanitarian Relief campaign by pledging to match every donation up to a total of $10,000 made to the Ukrainian Refugee Relief through the IRONMAN Foundation. These donations will go to organizations supporting Ukrainian citizens fleeing to Poland and Moldova, including the United Nations Development Programme of Moldova and World Central Kitchen. 

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