Trail Running calendar near Frederick 2026-2027

A multi-distance race at Boulder Reservoir, Colorado, featuring a mostly dirt and trail course with about 200 feet of elevation gain and views of the reservoir and the Rocky Mountains.

Experience the first ever trail race through the iconic red rocks of Roxborough State Park. Tackle 50 miles or 50k of technical singletrack and high country terrain before enjoying a finish line celebration with food trucks and local brew.

Trail races around Standley Lake in Westminster, Colorado, in August 2026 offering 50K, 35K, half, 10K and 5K on 100% dirt trails with out-and-back course formats, parking at Wayne Carle Middle School, and support stations along the routes.

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.

Experience a hilly 5k trail race through the scenic Lory State Park. Enjoy a low key atmosphere followed by pizza, beverages, and a vintage race shirt in this midweek summer series event.

A four-race trail series on Tuesday evenings in August in Lory State Park. Distances include 5K, 10K, and 12K routes with varying elevation. Pizza and drinks follow each race, with series awards at the end.

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.

A pair of trail races at Curt Gowdy State Park near Cheyenne on August 22, 2026, featuring 4 mile and 8 mile courses through aspens and pines with elevation rising from about 7,300 to 7,700 feet.

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.

Experience a fast and flat 12k trail race through the scenic Valley Trails of Lory State Park. Enjoy a low key atmosphere followed by pizza, beverages, and a vintage race shirt in Bellvue.

Experience the rolling trails and scenic views of Philip S. Miller Park in Castle Rock. With distances from 5K to 50K, this event offers well stocked aid stations and a supportive environment for all trail runners.

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 ultrarunning event in Loveland Colorado with timed events from 12 hour to 100 hour and distance races up to 200 mile on a two mile loop. Camping, continuous aid, chip timing, and event swag are provided.

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 commemorative running event in Longmont, CO on a flat loop course, offering multiple race formats including a 100 mile option and virtual entries, with on-course aid, finisher awards, and hot food available during overnight racing.