Ironman 70.3 Boulder

IRONMAN 70.3 Boulder

IRONMAN 70.3 Boulder is scheduled for June 13, 2026 in Boulder, Colorado, United States. The race course includes a swim in Boulder Reservoir, a bike on rolling, hilly terrain, and a run that uses local trails and roads. The event is staged at higher elevation near the Flatirons and the Rocky Mountains, and course materials note both rolling terrain and altitude as defining characteristics.

Reported environmental figures for the event include an average water temperature of 71°F / 22°C, a typical high air temperature of 79°F / 26°C, and a typical low of 61°F / 16°C. The event is listed as accessible for free and is designated as a qualifier for the IRONMAN 70.3 World Championship. Event resources referenced include an athlete guide, race week information, relay team entries, results, and spectator information. The host city features highlighted in event materials include Boulder Reservoir and the Pearl Street area as local points of interest. Information pages also reference volunteer opportunities, a VIP experience, and local triathlon club resources. Visit the organization's website for the most recent information.

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