Ironman 70.3 Boulder
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Event details
IRONMAN 70.3 Boulder takes place on June 13, 2026, in Boulder, Colorado, United States. The race is organized by IRONMAN and is listed as a World Championship qualification event. The venue area is set against the Flatirons and the Rocky Mountains. Geographic coordinates listed for the location are 40.01499, -105.27055.
Course and conditions
The event includes a swim in a reservoir, a mountain bike course with rolling and hilly terrain, and a run that follows trails and roads in and around Boulder. The race is described as occurring at high elevation. Typical environmental figures given are 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.
Local context and services
The race route highlights Boulder Reservoir and the city’s downtown area, including Pearl Street for post-race activities. The event materials reference local triathlon clubs, race-week and pre-race information, relay team options, and volunteer opportunities. Registration for the event is noted as open. Visit the organization's website for the most recent information.