Welcome to Racing Colorado Online!

Your source for Colorado race calendars, information, and entry forms for running, cycling (road bike and mountain bike), triathlon / multisport, and Nordic sports.  Just browse the calendars to find event details, entry forms, links to race sites, and registration information. One online source for your complete running calendar, cycling calendar, triathlon calendar (including other multisport races) and Nordic event calendar.

Park City Marathon This course takes runners from picturesque farms and meadows into charming Old Town Park City, across a skier bridge and along quiet residential streets and smooth, wide gravel paths. Wrap it up with a fast downhill finish!

Steamboat Springs Running Series The Steamboat Springs Running Series includes a variety of challenging and fun runs from 400 yards to 26 miles over some of Colorado's most spectacular terrain! Run through snow, creeks, over rocks, up ski hills, and more.

Breckenridge Summit Trail Running Series The Summit Trail Running Series is a trail running series consisting of six scenic and challenging courses in and around Breckenridge, Colorado. Short and long courses will be used at each venue. All ages and abilities welcome. June 11 & 18, July 9, 23, August 6, 13.

Run The Rock 5K Mountain running at its best! Jeep trails through the pines and aspens at Beaver Ranch with beautiful inclines and declines at 8400 feet! USATF certified "all trail run.  Live music and disk golf follow the run.

Run The Rocks 5K Run the 'Rocks is a 5K walk/run over rugged terrain matched with electrifying musical reverb at the world-famous amphitheatre. Whether you want to run like mad, or inhale the fabulous panorama, you don't want to miss this unique Red Rocks event!