Trail Running calendar near Castle Rock 2026-2027

Experience the historic Race Across the Sky in the Colorado Rockies. This legendary 100 mile ultramarathon features over 15,000 feet of elevation gain reaching heights of 12,626 feet.

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..

Test your endurance at Snow Mountain Ranch with a 60 hour challenge on a 10 mile mountain trail loop. This all inclusive event features lodging, meals, and recovery support as you aim for milestones up to 100 miles.

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.

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.

Experience a scenic run in Allenspark with majestic views of Mount Meeker and the Continental Divide. Choose between a competitive 5k or a casual 2k walk and bring your dog along for the race and an amateur dog show.

A multi-day ultra-running festival in Loveland, CO with timed and distance events on a 2-mile loop, camping in the park, limited RV permits, continuous aid station service, and a 200-runner cap.

Experience a high altitude mountain run at Arapahoe Basin covering 9.4 miles and 2,211 feet of vertical gain. Runners summit Little Lenawee peak and finish with live music and professional photos at Mountain Goat Plaza.

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.

Test your endurance at Staunton State Park with weighted rucking options ranging from 6.5 to 21.5 miles. Choose your load and tackle the Colorado trails to support the Special Forces Foundation.

A multi-event weekend in Longmont Colorado on September 11 and 12 offering distances from 5K to a 100 mile race on a flat 1.05 mile loop, with finisher awards, aid station support, and commemorative race apparel.

Experience a historic Colorado mountain tradition in Nederland with trail and road races. Choose between a half marathon, 10K, or a dog friendly 5K while winding through scenic trails and old town streets.

Trail races at Snow Mountain Ranch in Granby, Colorado include 50K, 33K, half marathon, 10K and 5K on dirt trails with significant elevation and aid stations on each course.

High altitude trail races in Empire, Colorado on September 12, 2026 offering 50K and 22K point to point courses on dirt single track with substantial elevation gain. The 50K requires prior ultra experience.

Experience a scenic trail run through sage brush and ponderosa pines in the Rocky Mountains. Choose between a half marathon or 10k distance with stunning views of the Collegiate Peaks in Buena Vista.

Trail races on North Table Mountain in Golden, CO on Sep 19, 2026, with 10 Mile and 5 Mile courses. Organized by BeyondHome, the event supports families moving from homelessness to self-sufficiency.

Follow the historic Barr Trail on a 13.3 mile journey from Manitou Springs to the 14,115 foot summit of Pikes Peak. Experience a 7,800 foot vertical climb through Colorado forests and alpine terrain in this high altitude event.