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October 18 - 19, 2025

Blue Sky Marathon & Half

Horsetooth Mountain Park • W Co Rd 38E Blue Sky Trailhead Fort CollinsCO  80526 Organized by Gnar Runners 2015 Save up to $10 on this event with ACTIVE Advantage!
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About this event

Taking place on the trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space, the Blue Sky courses take you on a north-south tour of the easternmost hogbacks of Northern Colorado’s Front Range mountains. With a moderate amount of elevation gain and loss and a variety of terrain, 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 cut-offs 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 dirt road (no motor vehicle access) and gravel trail, 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 BBQ, awards and generous sponsor giveaways.

Event details and schedule

For complete registration and event details, please visit our race website:

https://gnarrunners.com/blue-sky-marathon/

When

October 18 - 19, 2025

Saturday, Sunday

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Location

Horsetooth Mountain Park

W Co Rd 38E Blue Sky Trailhead Fort CollinsCO  80526

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Running-Trail-Marathon - Individual Age group/open

$0.00

Running-Half marathon - Individual Age group/open

$90.00

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