Trail Running calendar near Castle Rock 2026-2027

Two trail ultramarathons run from Roxborough State Park to Sharptail Trailhead, covering 50.2 miles and 31.1 miles. Routes feature sustained climbs, technical singletrack, and a long runnable descent with on-course support and stewardship e..

Experience the trails of Cheyenne Mountain State Park with three race distances ranging from a 5K walk to a 25K mountain challenge. This chip timed fundraiser supports park conservation through scenic and high elevation courses.

A trail race at Standley Lake in Westminster, Colorado offering 50K, 35K, Half Marathon, 10K and 5K on packed dirt trails with lake and Front Range views. The event includes on-site music, drop bag areas, and live split tracking.

Summit Grays and Torreys Peaks in this 8.8 mile Colorado endurance event. Participants must carry a 20lb dry load while tackling 4,101 feet of elevation gain.

A high altitude 100 mile out and back ultramarathon around Leadville Colorado, with over 15,000 feet of elevation gain and a high point at Hope Pass. Aid stations, drop bag locations, and pacers are part of the race structure.

A 6.2 mile out-and-back using the opening and closing miles of the LT100 Run course, the Leadville Trail 10K features paved and dirt roads at high elevation with one turnaround aid station and on-course nutrition from Neversecond and Skratc..

A 60 hour endurance challenge at Snow Mountain Ranch where runners repeat a 10 mile trail loop to reach milestone distances. Entry includes lodging, meals, training and recovery services.

Experience a high altitude trail run through the Rocky Mountains on 100 percent unpaved roads and trails. This dog friendly event in Fraser supports children facing cancer through the Shining Stars Foundation.

Experience high altitude trail running through the scenic singletrack and historic landmarks of Staunton State Park. Choose between a full or half marathon featuring sweeping mountain views and a festive post-race meal.

Trail half marathon in Evergreen, Colorado on August 22, 2026. The 11 mile course gains over 1,300 feet, tops out just under 9,000 feet, and runs through Elk Meadow and Too Long Trail from Buchanan Park Recreation Center.

A 5K trail race in Evergreen, Colorado on August 22, 2026, routed through lower Elk Meadow Park with course marshals. The event is cup-free, offers water refills at start and finish, and includes vendor tents and on-site food.

Rock Hawk Trail Races in Philip S. Miller Park, Castle Rock, CO offers 50K, 25K, 10K and 5K on rolling ridgeline trails with cup free aid stations, live split tracking, and official chip timing.

A community trail event at the Arapahoe County Fairgrounds on 08/29/2026 with a 5K run, a family 5K walk that allows leashed dogs, and a kids 1 mile plus demonstrations, vendors, and a pancake breakfast.

Run Like the Wind in Allenspark on August 29, 2026 features a 5K race, a 2K run/walk and a dog jog option. Proceeds benefit The Old Gallery and participating dogs are entered in an amateur dog show.

A multi-day ultrarunning event in Loveland Colorado with multiple timed and distance races on a 2 mile loop. Camping is allowed in a designated park area and a 24/7 aid station supports runners throughout the event.

A 9.4 mile mountain race at Arapahoe Basin on September 5, 2026, with 2,211 feet of ascent across summer roads, established singletrack and new high alpine trails. The field is capped at 700 and the course uses White River National Forest t..

Join the community for a 5K run or walk on a brand new dirt course at the North Arvada Middle School Athletic Complex. Support local high school racers before taking on this off road route yourself.

A load bearing endurance event at Staunton State Park on September 5, 2026. Routes range from 6.5 to 21.5 miles with loads from 10 to 40 lb and proceeds benefit the Special Forces Foundation.

A commemorative running event in Longmont, CO on a 1.05 mile loop with distances from 5K to 100 miles and virtual options. Aid stations, finisher awards, and participant shirts are provided.

A longstanding Nederland, Colorado running event offering a 5K road run, a 10K trail, and a trail half marathon, with family-friendly features, on-leash dogs allowed in the 5K, and costume encouragement.