Trail Running calendar near Longmont 2024-2025

The Castle Rock Trail Festival offers a variety of trail run options, from the liveBIG 5K to the challenging Ultra Marathon 50K, set on the beautiful and captivating Castle Rock ridgeline trail system. Participants can enjoy post-race refreshments, professional chip timing, and free photo downloads...

The Indian Creek Trail Runs, organized by the Human Potential Running Series, is an annual "Fall Classic" event featuring various distances such as 5-Mile, 15-Mile, 55k, and 50-Mile races. Participants will traverse through the beautiful single-track trails of the Denver Metro area, experiencing the..

The Blue Sky Trail Marathon & Half takes place in Fort Collins, CO, offering a challenging course between Horsetooth Mountain Park and Devil's Backbone Open Space. With over 3,500 feet of elevation gain and loss, the trail appeals to both experienced trail runners and beginners. The course consists ..

The Great Trailhead Foot Race offers a 10-mile and 5k trail run at Bear Creek Lake Park in Lakewood, CO. Participants can enjoy single-track trails with views of Denver's skyline. There is also a 1.1-mile youth race available. Registration fees include park admission, a post-run party, and a finishe..

The Beware the Bear Trail Races at Bear Creek Lake Park in Lakewood, CO offer 5km, 15km, 5+15 Double, and Kids 1km races on almost all dirt courses with a mix of short, steep hills, rollers, and challenging terrain. The event is a great introduction to trail racing for beginners and provides enough ..

The 16th Annual Backcountry Wilderness Half Marathon in Highlands Ranch is set to take place on November 2 at 9:00 am. The 13.1-mile trail race will traverse captivating landscapes, including the Douglas County East/West trail and the Backcountry Wilderness Area. Prize money will be awarded to the t..

The Bingo! Trail Party will take place in Byers on Saturday 9 November 2024. You can run between 10 and 54 miles.

The Sawmill Trail Runs at Staunton State Park offer 50k, 16-Mile, and 8-Mile distance options. The event takes place in a beautiful location with diverse terrain, ranging from high grassy meadows to granite cliffs. Participants can expect a challenging trail run with the possibility of snow conditio..

The Thumbs Up Vertical Challenge is an 8-hour ascent trail run taking place on December 7, 2024, in Estes Park, CO. Runners will ascend the Thumb Open Space trail, collecting poker chips at the turnaround point to determine their placing. Unique patches will be awarded at 3 milestones, with a specia..

The Santa's Summit Slam will take place in Estes Park on Saturday 14 December 2024. You can run 5 miles.

The Greenland Trail Races offer a variety of distances including a 50K, 25K, 8 Mile, and 4 Mile race on May 3, 2025, at Greenland Open Space in Larkspur, CO. Participants will enjoy a scenic course passing through grasslands, ponds, oak hills, and pine forests with views of Pikes Peak. The event pro..

The Samson's Revenge will take place in Estes Park on Saturday 17 May 2025. You can run between 10 and 55 kilometers.

The Ol' College Try 24 Hour Ultra is Denver's first and only 24-hour Ultra Race, taking place on May 24th and 25th, 2025, at Auraria Campus. Participants can choose to run for 24hrs, 12hrs, or 6hrs, pushing their limits and aiming for personal bests. The event promises unforgettable memories, incred..

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

The Estes Park's Backyard Ultra will take place in Estes Park on Saturday 21 June 2025.