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Blue Sky Trail Marathon & Half Marathon

Fort Collins, Colorado, United States

calendar_today 17 Oct, 2026 – 18 Oct, 2026

directions_run Running

language Official Website

sell $90.00 – $110.00

About the Event

Welcome to the Blue Sky Trail Marathon & Half, Fort Collins's original and only trail marathon.

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.

The marathon boasts 3,500 feet of elevation gain/loss, while the half marathon checks in at 1,800 feet, and 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 barbecue and generous sponsor giveaways.

Races Offered

Blue Sky Trail Marathon

Oct 17, 2026

straighten

Distance — 26.7 Miles

terrain

Type — Running

timer

07:00

sell

$110.00

Blue Sky Trail Half Marathon

Oct 18, 2026

straighten

Distance — 13.8 Miles

terrain

Type — Running

timer

07:00

sell

$90.00

Weather History

These values represent the 3-year monthly averages for October in Fort Collins.

thermostat Temperature

5.0° / 19.4°

wb_sunny Feels like

1.7° / 15.5°

light_mode Avg sunshine hours

9h 40m

water_drop Avg rainfall

0.5 mm

ac_unit Avg snowfall

0.1 cm

air Avg wind speed

8.1 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.0)

humidity_mid Humidity

51.9%

wb_twilight Sunrise

07:12

nightlight Sunset

18:18

About Fort Collins

Learn more about the host city, Fort Collins.

Fort Collins is a city of about 170,000 in north central region of the western U.S. state of Colorado. The seat of Larimer County, the city lies 59 miles (95 km) north of Denver on the Cache La Poudre River at the eastern edge of the Front Range foothills. Fort Collins is the home of Colorado State University and is a major research center.