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Whether a race, special group ride, training opportunity, or cycling-related community event, the 303 calendar showcases it all.  To have an event posted here please follow this link:  Event Policy Submission & Guidelines.

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Boulder Reservoir

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Boulder, CO United States

August 2018

Boulder Sunset Triathlon

August 25
Boulder Reservoir Boulder, CO United States + Google Map

Boulder Summer may be coming to an end, but our tri season is still heating up! Join us at the Boulder Reservoir for the 12th annual Boulder Sunset Triathlon, a local favorite. For the 4th year in a row we are the proud host of the Mountain Collegiate Conference race and the USAT Duathlon Race Series. Make sure to register early for this one because we will sell out in early August. This race is must-do, featuring a distance for…

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September 2018

Harvest Moon Long Course

September 16
Boulder Reservoir Boulder, CO United States + Google Map

Boulder   The Harvest Moon Triathlon the 19th edition of this event takes place at the beautiful Boulder Reservoir. on September 16th, 2018.  Est. in 2000 this Colorado classic  provides the veterans to beginners a challenging, affordable, and competitive race with a local flavor.  Whether this is your final event of the season, or a tune-up for a fall long course triathlon, don't miss the Harvest Moon!  The Aquabike portion is one of the fastest growing Aquabikes in the nation, while the…

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