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.

Boulder Marathon Will Likely Be Delayed Due To Fourmile Fire

Excellent event, thank you for bringing it back!

Gorgeous course, great post-race beer & food.

Very well organized and the view was amazing

Excellent race, with poor logistic support

Don't do it!  Suggestions for better CO Marathons

Fun race; roads should have been 100% closed

I love the back roads and didn't expect spectators

Course was good. Post-race offerings not so much.

Much improved.  A few more improvements needed.

disappointing as compared to previous years

I liked the dirt-packed roads, tech shirt, weather

Best Marathon and Half Marathon in the Nation!

Good race that still needs to work on a few things

Great, but I really only wanted to do 26.2!

a very well organized race that just gets better

Great Little Race for Experienced Runners

A beautiful course and well-organized race

Boulder Backroads Marathon

Marathon Results