Colorado Runner - Colorado's running news, events and results source

Scenic Boulder, Colorado and the majestic Flatirons provided a stunning backdrop for the 20th edition of the IRONMAN® 70.3® Boulder triathlon. With some of triathlon’s best on hand, a pair of Canadians took honors on the day.

Registration is open for two iconic Colorado races in August and September. Run the Rockies trail 10k and half marathon will take place on August 13, 2022. Run the Rockies road 10K and half marathon will occur on September 17, 2022.

The Denver Colfax Marathon is offering runners in Colorado an opportunity of a lifetime: to run a 5K on the runway at one of the busiest airports in the world.