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    ‘The Beast’ Long Course distance will be back for its second year! As one of Colorado’s most popular summer triathlons, Tri Boulder offers many different multisport race distances, all in one eventful day.

     Take in the natural beauty of the mountain backdrop that sets the scene for this iconic race destination. Most of the bike course will take place on rural Boulder county roads, with spectacular views of the Flatirons and surrounding green fields.

    Enjoy the after-race party with music, post-race food & beer, plus an awards ceremony with awards and prizes. Mark your calendar for this epic race at the end of July!

    Race Day Parking

    Boulder Reservoir Entry 

    The entrance fee to the park will be waived until 7:15am.

    Race Schedule


    Boulder Reservoir, Boulder, Colorado


    Race Day Schedule

    5:30am: Transition Area Opens

    5:45am: Race Day Packet Pick Up 

    7:05am: Boulder Beast Waves Start

    7:07am: Aquabike

    7:10:am: Duathlon Start

    7:13am-7:27am: Olympic Triathlon Starts

    7:30am-7:45am: Sprint Triathlon Starts

    7:15am: Olympic Waves Start

    7:30am: Sprint Waves Start

    8:30am: Swim Cut-Off

    9:15am: Awards will begin as soon as results are ready

    12:30pm: Bike Cut-Off

    3:30pm: Run Cut-Off / Course Closed