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Blue Sky Marathon

Fort Collins, CO
Sunday, October 18, 2026


No reviews yet


Course Description
Taking place on the trails between Horsetooth Mountain Park and the Devil's Backbone Open Space, the course takes you on a north-south tour of the easternmost hogbacks of Northern Colorado's mighty Front Range. With 3,500 feet of elevation gain and an equal amount of elevation loss, the route offers a little bit of something for everyone. It is designed to appeal to both veteran trail runners and those looking to experience their first trail racing adventure. The generous nine hour cut-off should ensure a successful day for everyone.

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.

After the race, kick back and enjoy the always-popular barbeque and generous sponsor giveaways.

October Other Marathons in October Other Marathons in Colorado Marathons near Fort Collins, CO



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Race Information

Race Dates

2026: Sunday, October 18, 2026
2025: Sunday, October 19, 2025

Course Information

Profile: Hilly
Type: Mostly Out and Back
Surface: Trail

Boston Qualifier?: No
World Marathon Major Qualifier?: No

Race Day Weather

Mean Temp.: 51°F (10°C)
Average High: 64°F (17°C)
Average Low: 37° F (2°C)

PR Score & Course Score

PR Score: N/A
Course Score: N/A

Race Size

2025: 143 Finishers
2024: 186 Finishers
2023: 221 Finishers
2022: 119 Finishers
2021: No Results
2020: 127 Finishers

BQ Percentages

2025: N/A
2024: N/A
2023: N/A
2022: N/A
2021: N/A
2020: N/A

Miscellaneous Information

Pace Groups?: No




Blue Sky Marathon Rankings, Course Speed & Boston Qualifier Statistics

The Blue Sky Marathon was the 310th largest marathon in the U.S. in 2025 based on the number of finishers. In 2024, it ranked as the 254th largest marathon in the U.S..



Elevation Chart


Max Elevation: 6502 feet (1982m)
Min Elevation: 5335 feet (1626m)

Elevation Gain: 3491 feet (1064m)
Elevation Loss: 3491 feet (1064m)


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Hotel & VRBO Accommodations for the Blue Sky Marathon

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Comparison Tool

If you ran the Blue Sky Marathon in 5:32:00, what would your time in other marathons be?

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Race Reviews


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