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- A Run Through Time
- American Discovery Trail Marathon
- Aspen Valley Marathon
- Autumn Colors Marathon
- Blue Sky Marathon
- Boulder Marathon
- Colfax Marathon
- Colorado Marathon
- Estes Park Marathon
- Grand Valley Marathon
- Leadville Trail Marathon
- Mt. Sneffels Marathon
- Pikes Peak Marathon
- Rim Rock Marathon
- Rock N Roll Denver Marathon
- Run Through Time Marathon
- Silverton Alpine Marathon
- Steamboat Marathon
- Turkey Track Trail Marathon
- Xterra Marathon Of Trail Races