The Blue Sky Marathon takes place on the trails between Horsetooth Mountain Park and the Devil's Backbone Open Space. The course is 100% dirt and 90% sweet Colorado singletrack. The terrain ranges in difficulty from smooth dirt trail to technical rock gardens. A small portion of the route is on smooth dirt road (no motor vehicle access) and gravel bike path, with the meat of the running done on the beautiful and distinctive redstone hardpack of the Blue Sky Trail.
| Name | Distance | Gain From Start | Loss From Start | Elevation | Latitude | Longitude | |
|---|---|---|---|---|---|---|---|
| Start | Mile 0.0 | 0 feet | 0 feet | 5,490 feet | 40.518274 | -105.168476 | |
| Blue Sky Aid | Mile 9.2 | 1,350 feet | 1,350 feet | 5,472 feet | 40.51856 | -105.167596 | |
| Indian Summer North 1 | Mile 13.2 | 1,820 feet | 1,800 feet | 5,495 feet | 40.472172 | -105.153387 | |
| Indian Summer South 1 | Mile 15.6 | 2,105 feet | 2,175 feet | 5,373 feet | 40.457723 | -105.154167 | |
| Hunter Turn Around | Mile 17.9 | 2,500 feet | 2,500 feet | 5,452 feet | 40.432802 | -105.162618 | |
| Indian Summer South 2 | Mile 20.3 | 2,695 feet | 2,765 feet | 5,372 feet | 40.457723 | -105.154167 | |
| Indian Summer North 2 | Mile 22.7 | 3,070 feet | 3,050 feet | 5,495 feet | 40.472172 | -105.153387 | |
| Finish | Mile 26.7 | 3,500 feet | 3,500 feet | 5,484 feet | 40.517835 | -105.167899 |