Boulder IRONMAN 70.3 to close local roads


August 4, 2021

Karen Copperberg

On Saturday, Aug. 7, several local streets, including Highway 119, North 75th Street, and Niwot Road, will be subject to delays due to the Boulder Ironman 70.3. The race runs from 7 a.m. to 2 p.m. and is considered a half-triathlon, with participants running, swimming and biking on the course. In addition, Boulder Reservoir will be closed to everyone except those with an Ironman access pass.

Anyone traveling in the area should expect significant delays. Alternative routes are recommended.

For information about the courses and impacted roadways, or to view maps of the race, visit the IRONMAN 70.3 website:


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