Ironman 70.3 Boulder

JUN

12

2027

IRONMAN 70.3 Boulder is a 70.3 triathlon in Boulder, CO with a reservoir swim, hilly bike and run courses and racing at higher elevation.

Sat 12 Jun 2027

Boulder, Colorado

Website

Middle distance 1.9 90 21.1 km

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IRONMAN 70.3 Boulder - Boulder, CO

IRONMAN 70.3 Boulder is scheduled for June 12, 2027 in Boulder, Colorado, United States. The event features a reservoir swim at Boulder Reservoir with an average water temperature of 62 °F / 17 °C. Course descriptions note rolling and hilly terrain on the bike and run segments, and the race takes place at higher elevation with the Flatirons and the Rocky Mountains visible from the route.

Expected air temperatures for the event window are listed as a high of 91 °F / 33 °C and a low of 55 °F / 13 °C. The race is identified as a qualifier for the 2027 IRONMAN 70.3 World Championship and the event is marked as Flex90 Eligible. The organizer is IRONMAN and the event listing indicates it is accessible for free.

Post-race options include access to Boulder's downtown Pearl Street area and a range of local activities for athletes and supporters. The course emphasizes outdoor recreation areas around Boulder Reservoir and routes that pass near the Flatirons, with a community focus on endurance sport and mountain scenery. Visit the organization's website for the most recent information.

70 mi

Ironman 70.3