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Ironman 70.3 Boulder

Triathlon: Swim 1.2mi, Bike 56mi, Run 13.1mi

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IRONMAN 70.3 Boulder kicks off at the pristine Boulder Reservoir with its spectacular Rocky Mountain backdrop.

This event has been an athlete favorite for over a decade. IRONMAN 70.3 Boulder is one of the fastest IRONMAN events to sell out each year—making it one of the most sought-after races in the country.

The extremely fast course provides personal records for many, even our local professional field. Where else in the country can you race against the best in the world on their home training ground?

Boulder was founded in 1858, featuring the renowned Red Rocks amphitheater and Chautauqua, an unparalleled hiking, music, and picnic destination. From vineyards and breweries to shopping and mountain climbing, there are activities for everyone. Popular venues include the Pearl Street Mall and the 29th Street Retail District. Pearl Street's pedestrian throughway comes alive at night with live music and entertainment for everyone. The creativity and spirit of Boulder, Colo. will bring you back year after year.Check out bouldercoloradousa.com to plan your trip.

How to enter the Ironman 70.3 Boulder

  1. 70.3 (Half Ironman)

    Triathlon: Swim 1.2mi, Bike 56mi, Run 13.1mi
    $300–$445
    Event passed

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Ironman 70.3 Boulder weather forecast

Clear throughout the day.

93°F
Predicted highs
57°F
Predicted lows
IconLight breeze possible, up to 7mph

Meet the organizer

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#52

Ironman are ranked #52 in the UK out of 414 organizers

"Swim 2.4 Miles. Bike 112 miles. Run 26.2. Brag for the rest of your life." - John Collins, IRONMAN co-founder Since its inception, IRONMAN has been represented by ambitious and courageous people who aren't afraid to push their limits. Take a walk through history with us, through some of the finest and most memorable moments in IRONMAN racing.

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