Ironman 70.3 Boulder

JUN

2026

Experience IRONMAN 70.3 Boulder with a swim at Boulder Reservoir and hilly bike and run courses that wind through trails and roads beneath the Flatirons and Rocky Mountains at high elevation. Scenic, tough, and offering World Championship qualifying spots.

Sat 13 Jun 2026

Boulder, Colorado

Website

Always double-check with the organizer's website! This page may contain affiliate links.

Event overview

IRONMAN 70.3 Boulder is scheduled for June 13, 2026 in Boulder, Colorado, United States. The event is organized by IRONMAN. The race listing notes Flex90 eligibility and includes information on World Championship qualification for the IRONMAN 70.3 series.

Course and conditions

The course includes a swim in Boulder Reservoir, a bike course described as hilly with rolling terrain, and a run course described as hilly that uses local trails and roads. The venue is set against the Flatirons and the Rocky Mountains and is held at a higher elevation. Typical conditions listed for the event show a high air temperature of 79°F (26°C), a low air temperature of 61°F (16°C), and an average water temperature of 71°F (22°C). Visit the organization's website for the most recent information.