Blue Sky Trail Marathon 2025

• Scenic trail course: 100% dirt, 90% singletrack through Horsetooth Mountain Park to Devil's Backbone.
• Challenging elevation: Over 3,500 feet of gain and loss.
• Generous nine-hour cut-off time for all levels.
• Race starts in Horsetooth Mountain Open Space.
• Post-race barbecue and sponsor giveaways.

The Blue Sky Trail Marathon stands out as Fort Collins' premier and only trail marathon, guiding runners through a scenic north-south journey between Horsetooth Mountain Park and Devil's Backbone Open Space. This marathon unfolds upon the stunning easternmost hogbacks of Northern Colorado's Front Range mountains, offering an all-encompassing experience of local terrain. Runners will traverse a 26.7-mile course that is entirely composed of dirt paths, with 90% of the trail being the much-appreciated Colorado singletrack. The course itself challenges participants with 3,500 feet of elevation gain and an equivalent descent, presenting a hearty mix of smooth dirt roads, technical rocky gardens, and distinctive redstone hardpack underfoot. Participants can savor breathtaking views of the reservoir and are embraced by the area's rugged natural beauty. Known for its inclusive nature, the marathon allows a generous 9-hour cut-off, making it accessible to a wide range of runners. With a registration cap at 600, the event ensures a personalized experience enhanced by post-race celebrations including a BBQ and generous sponsor giveaways. Runners new to trail marathons as well as seasoned veterans will find the diverse terrain and the meticulously organized setup, complete with well-marked trails and supportive volunteers, both challenging and rewarding.

Expect temperatures between 35-64°F (2-18°C) in mid-October during the Blue Sky Trail Marathon in Fort Collins, Colorado. Look for moderate humidity and prepare for light winds. Be ready for cool conditions with a chance of light precipitation.

The Blue Sky Trail Marathon offers a 26.2-mile adventure through the stunning landscapes between Horsetooth Mountain Park and the Devil's Backbone Open Space in Fort Collins, Colorado. This trail run is entirely on dirt, with 90% of it being singletrack, featuring a compelling mix of smooth paths and technical rock gardens. Runners will face a challenging 3,500 feet of elevation gain and loss, with the course peaking at 6,502 feet and dipping to 5,335 feet.

As you navigate the easternmost hogbacks of Northern Colorado's Front Range, you'll enjoy sweeping views of Horsetooth Mountain and the Devil's Backbone. The trail winds through forests and meadows, with distinctive redstone hardpack underfoot adding to the unique experience. The course's variety in terrain, combined with its significant elevation changes, demands both physical and mental stamina, while offering breathtaking vistas that reward every effort.

With a generous nine-hour cut-off time, the marathon welcomes both seasoned trail runners and newcomers eager to tackle their first trail race. Embrace the challenge and beauty of the Blue Sky Trail Marathon, where every mile showcases the natural splendor of Northern Colorado.

Nestled in the foothills of the Rockies, Fort Collins, Colorado, offers more than just a stunning backdrop for the Blue Sky Trail Marathon. Beyond the race, immerse yourself in the city's vibrant cultural scene and breathtaking outdoor attractions. Start with a visit to Horsetooth Reservoir for panoramic views and outdoor adventures. For a rewarding hike, head to Arthur’s Rock in Lory State Park, where you’ll be greeted with sweeping vistas of the city and surrounding landscapes.

Fort Collins is a hub of creativity and entertainment. Explore the Downtown Creative District, where you can wander through art galleries and catch live performances from the symphony orchestra or local theater groups. Keep an eye out for painted pianos scattered across the city as part of the Pianos About Town project, inviting spontaneous music-making. If you're a food enthusiast, the local food truck scene, especially the Food Truck Rally at City Park, offers a tasty array of options.

Extend your visit with a trip to the Cache la Poudre River Canyon for hiking and biking amidst spectacular scenery. Don't miss the Mishawaka Amphitheater for a memorable concert experience in the heart of the canyon. With its blend of natural beauty and cultural richness, Fort Collins promises a travel experience as rewarding as the marathon itself.