Boulder Rez Marathon

• Marathon:- Run 26.2 Miles
• Half Marathon:- Run 13.1 Miles
• 10k:- Run 6.2 Miles

The Boulder Rez Marathon is Boulder’s biggest marathon due to its early October date, which brings out the best running temperatures of the year. This popular course will take you around the Rez on some awesome single tracks, a packed-dirt trail on the dam, and paved Reservoir Roads. This race will sell out at 1,000 participants, so register early to guarantee a spot in the race!

This amazing run course around the Boulder Reservoir is astonishing and remains mostly on dirt roads and dirt trails. The course is flat with only 200 feet of gain, and will take you across the Boulder Reservoir, around some beautiful views of the Rocky Mountains. The marathon will complete 4 loops, while the half athletes will finish 2 loops, and the 10K will complete one loop, all clockwise. 

• Scenic, mountain and water course views 

• ​Run entirely around the Boulder Reservoir

• Extremely spectator friendly course

• Completely closed to traffic - No running on the side of a highway!