Trail Running calendar near Longmont 2024-2025

The Lionshead Ruck will take place in Pine Junction Area on Saturday 9 November 2024.

The Bingo! Trail Party is a unique running event organized by the Human Potential Running Series, taking place at May Farms in Byers, Colorado. Scheduled for November 9, 2024, this third annual event invites runners of all abilities to participate in a fun, community-focused atmosphere. Participants..

The Reuter-Hess Trail Incline is a running event taking place in Parker, CO, featuring a challenging 10k course and a 1-mile kids race. The 10k course includes a unique lollipop loop with a mix of flat, rolling, and rocky terrain, as well as a steep incline with approximately 600 feet of elevation g..

The Mountain Peacock 50k is an inaugural ultra running event set in Golden, Colorado, designed for adventurous spirits seeking a no-frills experience. Participants will conquer four peaks—South Table Mountain, North Table Mountain, Mount Galbraith, and Lookout Mountain—while navigating a self-suppor..

The Thumbs Up Vertical Challenge is an exciting running event held at the Thumb Open Space in Estes Park, CO. Participants will embark on an 8-hour ascent along a 1km out-and-back trail, gaining 540 feet in elevation. Runners must collect poker chips at the turnaround point to track their progress, ..

The Sawmill Trail Runs, part of the Human Potential Running Series, is an annual trail running event held at Staunton State Park in Pine, Colorado. The 2024 edition features three race distances: a 50k, a 16-mile, and an 8-mile run, with a combined capacity of 200 runners. The event, which began in ..

Santa's Summit Slam is a versatile running event that takes place in various weather conditions, featuring a 5-mile course that includes 30% gravel roads and 70% single-track trails. Participants can expect a unique experience, whether running on dry trails, navigating sloshy paths with traction spi..

The Winter's End Snowshoe Races, hosted at Granby Ranch Resort in Granby, CO, is an exciting winter sports event designed for runners of all skill levels. Scheduled for March 8, 2025, the event features multiple race distances, including a marathon, 16-mile, 8-mile, and a 2-mile fun run. Participant..

Rock Hawk is a trail running event taking place in Castle Rock, CO, featuring distances of 50K, 25K, 10K, and 5K. Set against the scenic backdrop of Miller Park and Ridgeline Trail systems, the race offers a thrilling experience for both novice and experienced runners. The trails are designed to cha..

The Greenland Trail Races, held annually in May at the Greenland Open Space in Larkspur, Colorado, offers participants a choice of four distances: 4M, 8M, 25K, and 50K. This event is known for its scenic trails that traverse native grasslands, ponds, and forests, providing stunning views of the surr..

Niwot's Challenge is a challenging ultramarathon held annually in Colorado's Front Range, designed for experienced runners. Modeled after the Barkley Marathons, this grassroots event features a secretive course that requires participants to navigate using a map and compass, with limited aid availabl..

Samson's Revenge is a trail running event held at the YMCA of the Rockies in Estes Park, Colorado, honoring the legacy of Samson, a famous elk poached in 1995. Participants can choose from three distances: 10K, 27K, and 55K, featuring a challenging course with significant elevation gain, particularl..

The Ol' College Try 24 Hour Ultra is Denver's inaugural 24-hour ultra race, taking place at Auraria Campus. Organized by Rise Again Running Events in collaboration with Tall Tales Ranch, this event invites runners of all abilities to challenge themselves and achieve personal milestones. Participants..

The North Fork 50 Mile/50K is an ultramarathon set in the scenic Colorado mountains near Denver. This event features a challenging course that is entirely on soft surfaces, primarily consisting of singletrack trails, with some sections of double track road. Runners will experience diverse landscapes..

The Crazy Legs 10K+ Trail Run will take place in Loveland on Sunday 1 June 2025.

Estes Park's Backyard Ultra is a unique ultra-running event set against the stunning backdrop of Lake Estes, Colorado. Participants must complete a distance of 4.252 miles within one hour, every hour, until only one runner remains. This format continues indefinitely, with the last runner standing be..

The Timberview Trail Run is an exciting annual event held at Lory State Park in Colorado, featuring three race distances: a 10-mile, a 5-mile, and a 5K trail run. Scheduled for June 28, 2025, this event welcomes participants of all ages and skill levels, offering a scenic course with stunning views ..

The Silverheels Trail Runs, part of the Human Potential Running Series, is an annual event featuring multiple race distances, including a 100-Mile, 100k, 50-Mile, 60k, 19-Mile, and 10-Mile. Set in the stunning Colorado Front Range at elevations over 10,000 feet, the course offers a mix of single tra..

The Never Summer 100km and 60km races, organized by Gnar Runners, will take place in July 2025 in the stunning Colorado Rockies. This challenging mountain race features a course that traverses diverse terrains, including high alpine ridges, meadows, and boulder fields, with significant elevation cha..

The Summit 200 is an extraordinary 200-mile mountain race set in Summit County, Colorado, featuring a challenging loop that showcases stunning hiking trails, forest roads, and scenic views. Runners will experience significant elevation changes, with the lowest point above 9,000 feet and sections rea..