Runners made their way along the Mary Carter Greenway trail as they take part in the 10K Bolder on the Run race presented by the Bolder Boulder on May 30, 2021 in Littleton.

Because of COVID-19 the annual running of the popular Memorial Day Bolder Boulder 10K race could not take place. Instead organizers scheduled a Memorial Day weekend series of races. More than 8,100 runners signed up to run in six different locations along the Front Range over the course of three days during the holiday weekend. Saturday, Sunday and Monday runners signed up to run the annual 10k race in Littleton, Erie, Greenland Open Space near Larkspur, Broomfield, Firestone and Loveland. Runners were put into time blocks where they could choose to take off at anytime within their time block. Time blocks were every two hours starting at 6:30 a.m. and finishing at 8:30 p.m.

The race in Littleton took place in and out and back course on the Mary Carter Greenway Trail that took runners and walkers along the South Platte River.

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