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| Name of Trail Run | City | Rating | Run length |
| 3 Sisters / Alderfer | Evergreen |  |
7 |
| All Crescent Trails | Fairport | |
50 |
| Apex Park | Golden | |
8 |
| Aqueduct Trail | Keystone | |
6 |
| Atv/azt | Tucson | |
10 |
| Backcountry | Highlands Ranch | |
1 |
| Barney Ford To Moonstone | Breckenridge | |
5 |
| Barr Trail (Pikes Peak) | Manitou Springs | |
26 |
| Bear Creek Canyon Loop | Colorado Springs | |
8 |
| Bear Creek Lake Park | Lakewood | |
10 |
| Bear Creek Regional Park | Colorado Springs | |
6 |
| Beaver Creek Ski Resort | Avon | |
5 |
| Bergen Peak | Evergreen | |
10 |
| Berry Creek Loop | Edwards | |
4 |
| Betasso Preserve | Boulder | |
2 |
| Black Forest Regional Park | Black Forest | |
4 |
| Blodgett | Colorado Springs | |
3 |
| Bluffs Regional Park Trail | Lone Tree | |
4 |
| Bobcat Ridge | Masonville | |
15 |
| Bobcat Ridge | Masonville | |
4 |
| Boy Scout Trail | Glenwood Springs | |
5 |
| Buckhorn Loop | Colorado Springs | |
4 |
| Buffalo Creek | Pine | |
14 |
| Centennial Cone Park | Idaho Springs | |
13 |
| Ceran Saint Vrain Loop | Jamestown | |
5 |