Trail Running calendar near Larkspur 2025-2026

The Byers Peak Stampede Half Marathon & 5K Run is an exciting running event set in the stunning Rocky Mountains, just 60 miles from Denver. Scheduled for August 23, 2025, the event features a challenging half marathon and a 5K, catering to athletes of all levels. The courses primarily traverse dirt..

The Staunton Rocks! Marathon and Half Marathon, scheduled for August 23, 2025, takes place in the scenic Staunton State Park, located in Colorado's Front Range Mountains. This event features a challenging yet accessible course, primarily on singletrack trails, allowing participants to enjoy breathta..

The Westminster Night Trail is an annual nighttime running event held at Standley Lake in Westminster, Colorado. Celebrating its 12th year, the race offers distances from 5K to 50K, all on scenic, packed dirt trails illuminated by lights and the stars. Participants enjoy stunning views of the lake a..

The Rock Hawk Trail Races will take place in Castle Rock on Saturday 30 August 2025. You can run between 5 and 50 kilometers.

The American Heroes Run is a commemorative running event held in Longmont, Colorado, designed to honor the heroes of 9/11 and celebrate patriotism. Participants can choose from various race distances, including a 100-mile run, marathon, half-marathon, 9.11-mile run, and a 5K, all set on a scenic 1.0..

Devil on the Divide is a challenging trail race held in Empire, Colorado, featuring 50K and 22K courses. The event offers breathtaking views of Clear Creek County and the Continental Divide, with participants reaching altitudes over 13,000 feet and experiencing significant elevation gains—over 6,500..

The Cirque Series - Arapahoe Basin is a challenging mountain running event set for September 6, 2025, in Keystone, Colorado. Participants will tackle a 9.4-mile course with an elevation gain of 2,411 feet, starting at 10,780 feet. The race features three divisions: Sport, Expert, and Pro, catering t..

The HRCA Wildcat Mountain Trail Races, scheduled for September 6, 2025, in Littleton, Colorado, features a variety of events including a 10K, 10M, and a Kid's Race. The race begins at the Douglas County East/West trailhead and takes participants through the scenic HRCA Backcountry Wilderness Area. R..

The Breckenridge Oktoberfest 5K is an exciting running event that kicks off the annual Oktoberfest celebration in Breckenridge, Colorado. Set against the stunning backdrop of the changing aspens and beautiful mountain scenery, this 5K trail run takes participants through the picturesque Town of Brec..

The Ned Ned Half Marathon is a longstanding trail running event held in Nederland, Colorado, celebrating its 43rd year. Participants can choose from a half marathon, 10K, or 5K race, with courses winding through scenic dirt roads and single-track trails in the Colorado mountain town. The event is fa..

The Pony Express Trail Run is a scenic trail race held at Rampart Reservoir, offering two distances: 8.5 miles and 16 miles. Participants enjoy running along well-marked single-track trails, crossing creeks, and observing wildlife amid Colorado's autumn landscape. The race emphasizes community and p..

The Pikes Peak Marathon, established in 1956, is the oldest continuously held marathon in the United States. This challenging race takes participants from Manitou Springs, Colorado, to the summit of Pikes Peak, reaching an elevation of 14,115 feet, and back down, covering a total of 26.2 miles. The..

The 24 Hours of Palmer Lake is an endurance running event held on a scenic 0.82-mile loop surrounded by mountains at Palmer Divide, Colorado. Participants aim to cover the greatest distance within 24 hours, with awards for the top finishers and those who reach 100 miles. The event fosters a communit..

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring both 30K and 50K races. Set against the stunning backdrop of the Collegiate Peaks, participants can enjoy a mix of singletrack and forest roads, with significant elevation gain. This event caters to runners..

The Sawatch Ascent is a challenging 50k running event set in the stunning Colorado mountains, taking place on September 28, 2025. Starting and finishing at the base of Mount Princeton, participants will experience a significant elevation gain of 7,000 feet, reaching a high point of 13,150 feet. The..

The Castle Rock Trail Festival, also known as the liveBIG Run, is a community-focused outdoor event offering various trail running options, including a 5K, 10K, half marathon, and a 50K ultramarathon. Participants can explore the scenic trails of Philip S. Miller Park and Ridgeline Open Space, with..

The Rim to Rim Royal Gorge Races is an exciting running event featuring a 5K road run, an 8-mile trail run, and a half marathon trail run, all set against the stunning backdrop of the Royal Gorge Bridge in Canon City, Colorado. Participants will experience challenging terrains and breathtaking views..

The Bear Chase Race is an endurance festival held at Bear Creek Lake Park in Lakewood, Colorado, featuring a variety of race distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K. Scheduled for October 4-5, 2025, this event is ideal for both novice and experienced trail runners, offerin..

The Above the Clouds Ultra is an annual running event held in Woodland Park, Colorado, featuring 50k and 10k races. Set against the stunning backdrop of Pikes Peak, participants experience the vibrant fall colors and scenic trails of Rampart Reservoir. The course begins in the "City Above the Clouds..

The Pikes Peak Road Runners Fall Series is a popular cross-country running event featuring four trail races held in various parks around Colorado Springs. Each race offers a unique challenge, with distances increasing from 3.8 miles to 7.4 miles as the series progresses. Participants must be at leas..