Trail Running calendar near Larkspur 2026-2027

Tackle the sustained climbs and technical trails of Roxborough State Park in this late-summer ultramarathon. Choose between the 50K or 50 mile distance on exposed, challenging terrain. Be prepared for hot conditions, spaced aid, and a manda..

Hit the trails at Cheyenne Mountain State Park with this trio of scenic races. Choose from a challenging 25K mountain course, a 10K trail race, or an accessible 5K run/walk. All events support the park and feature chip timing on beautiful s..

Run the trails around Standley Lake in Westminster, Colorado. Choose from five distances, from a 5K to a 50K, on out-and-back dirt routes. Experience a cupless race with scenic views and a festive atmosphere.

The Leadville Trail 100 Run is a legendary 100-mile ultramarathon in the Colorado Rockies. With over 15,000 feet of elevation gain and a summit over 12,500 feet at Hope Pass, it's a massive high-altitude challenge. Finishers within 30 hours..

Experience the high-altitude scenery of Leadville on this 10K course, which follows the first and final miles of the famous LT100 Run. With a single aid station and awards for top finishers, it's a classic mountain run. Registration is open..

Run on 100% unpaved trails in the Rocky Mountains near Fraser. Choose between a high-elevation half marathon or a 5K, with leashed dogs welcome. All proceeds support the Shining Stars Foundation.

Experience the beautiful singletrack trails of Staunton State Park in Colorado. This event features a marathon and half marathon through historic mountain terrain with expansive views and a festive post race meal.

Explore the rolling trails of Castle Rock's Miller Park at the Rock Hawk Trail Races. Choose from four distances, from a 5K to a 50K, on a course that supports local trails. The event features aid stations and a festive start/finish area fo..

Join a family friendly trail event in Aurora featuring 5K distances and a kids run. Enjoy dog demonstrations, a pancake breakfast, and a kids fun zone while supporting therapy and patrol K9 units.

A mountain trail race at Arapahoe Basin on September 5, 2026 covering *9.4 miles* and *2,211 ft* of ascent, with Sport, Expert and Pro divisions, a 700 runner cap, on course aid stations and category prizes.

The American Heroes Run takes place on September 11 and 12, 2026 in Longmont, Colorado. Participants can run various distances on a flat, fast loop course. The event honors American heroes with special awards and a patriotic theme.

Experience trail and road running at 8,236 feet in Nederland, Colorado. Choose between a trail half marathon, a 10K, or a family friendly 5K while supporting local youth programs.

Tackle high-altitude trails in the Colorado Rockies. Choose between a demanding 50K or a 22K point-to-point course, both featuring single-track paths and significant climbs. This remote race requires experience and preparation.

The Trail Sisters Women's Half Marathon & 10k is a women's trail running weekend in Buena Vista, Colorado. The courses travel through sage and pine terrain with views of the Collegiate Peaks. It's presented as a supportive community event f..

Experience the scenic trails of North Table Mountain in Golden with 5 and 10 mile races. Run through challenging switchbacks and loops to support families transitioning from homelessness.

Test yourself on the iconic Pikes Peak Ascent, a 13.3 mile run from Manitou Springs to the summit with breathtaking views and huge elevation gain. A bucket list challenge for runners who crave high altitude adventure.

The 71st Pikes Peak Marathon is a 26.2-mile mountain run with nearly 8,000 feet of elevation gain and loss. The route goes from Manitou Springs to the summit of Pikes Peak and back.

Event Overview The West Line Winder is a trail running event taking place in Buena Vista, Colorado. It is part of the larger 14er Fest, a festival held in late September that aims to unite various trail user groups. The event is organized b..

Experience the scenic trails of Bear Creek Lake Park at this multi day endurance festival in Lakewood. With distances ranging from a 5K to a 100K ultra marathon, the event features fast non technical dirt paths and panoramic views.

Experience the scenic HRCA Backcountry Wilderness Area with dirt trail races for all ages. Enjoy rolling hills and mountain views followed by a pancake breakfast and finisher medals in Littleton.