Run the beautiful rural backroads of Boulder, Colorado. Start and finish at the Boulder Reservoir. 85% of course is on soft-pack county dirt road. Fully supported; great food and drink at the finish, including local microbrews! Half marathon is out and back; full is a loop course...both are relatively flat, with a few gentle hills. A great first-timers race. Register today!

Boulder Backroads Marathon

Human Interest Story

The Boulder Marathon has been postponed to October 3 due to the Fourmile Fire that swept through the area earlier this week.

Boulder Marathon Rescheduled For October 3

The Boulder Marathon has been postponed due to fire's in the area. A date of October 3 or after is being considered.

Wildfire's Impact Felt By Boulder Marathon

The Boulder Marathon is scheduled for September 19 but race organizers fear that the fire will delay the marathon.

Marathon Summary

Marathon Results