Trail Running Calendar Colorado 2025-2026

Take on Kendall Mountain near Silverton Colorado with 12 mile and 11K options. Tackle steep jeep road climbs and a final summit scramble for sweeping alpine views on a rugged out and back course.

Barr Trail Mountain Race is a 12.6-mile summer mountain running event along Pikes Peak. The course starts at Cog Railway Station in Manitou Springs (6,570 ft), ascends Barr Trail to Barr Camp at 10,200 ft, then turns, descends, and finishes..

Experience high alpine trails from Gould Colorado in the Never Summer range with 100 km and 60 km options. Rugged singletrack, big climbs and alpine lakes await for a true mountain adventure.

Take on Pikes Peak Ultra in Colorado Springs on July 25, 2026, with distances from 20K to 50 Mile starting and finishing at Bear Creek Regional Park. Expect scenic trail climbs, Pikes Peak views and a true mountain test for trail runners.

The Summit 200 is a 200 mile loop around Summit County Colorado across high alpine trails and peaks above 12,000 feet. Limited to 100 runners with a 110 hour cutoff, it requires a prior 100 mile finish and fierce self sufficiency.

Join the Wild West Relay, a scenic point to point 200 miles across Colorado from Fort Collins to Steamboat Springs. Run solo or with teams from 1 up to 12 people as you tackle mountain passes, open roads and big western views.

Sheep Mountain Trail Runs in Fairplay Colorado offers 50 mile, 50k and half marathon courses across technical singletrack and alpine roads averaging over 10,600 ft. Expect sweeping mountain views, tough terrain and variable August weather.

Tackle 15 miles and 3,100 feet of climbing through high alpine La Plata Mountains, peaking near 12,200 feet at Kennebec Pass. Limited to 150 runners, this rugged trail race supports Search and Rescue and rewards top finishers with pies.

Take on Aspen Backcountry with 50K, marathon or heavy half routes from Rio Grande Park, mostly on scenic dirt trails and high alpine terrain. After the finish enjoy the Duck Derby festival with live music, food and local vendors.

Run the Lory Summer Trail Series in August at scenic Lory State Park with 5k, 10k and 12k options across fast valley and challenging hill routes. Finish with pizza and drinks, grab a free vintage shirt while supplies last, and race for seri..

High Five 100 is a self guided mountain challenge from Lake City, Colorado: roughly 90 to 105 miles with about 40,000 ft of climbing and summiting five 14ers. Finish the unmarked route within 48 hours; registration opens January 1, 2026.

Run the Rockies Trail in Frisco, Colorado is a scenic 5k, 10k and half marathon on single track and dirt roads with views of Dillon Reservoir and the Ten Mile Range and a lakeshore finish. The half gets new single track in 2026.

Run the legendary Leadville Trail 100, a 100 mile high country ultra through the Colorado Rockies with epic climbs to Hope Pass and rugged mountain scenery. Chase the iconic buckle and an unforgettable high altitude adventure.

High altitude trail running in Fraser, Colorado on August 22, 2026, with a scenic half marathon through dirt roads and trails and a 5K around the rodeo grounds. Proceeds support the Shining Stars Foundation for children with cancer.

Choose from 50K, 25K, 10K or 5K on rolling singletrack and multiuse trails with sweeping views at Philip S. Miller Park in Castle Rock, Colorado. Portions of proceeds support Castle Rock open space and local charities.

Front Range Ultra Dayze invites ultrarunners to a multi day looped trail festival along River's Edge in Loveland, Colorado, offering timed and distance events from 12 hour to 200 mile. Enjoy scenic two mile loops, around the clock aid, camp..

Challenge yourself on the Cirque Series at Arapahoe Basin on September 5, 2026 in Keystone, Colorado. This scenic 9.4 mile mountain course with 2,211 ft of climbing delivers steep, technical trail and big alpine views in a capped field.

Epic point to point ultramarathon from Mt Crested Butte to Aspen across the Elk Mountains. Tackle 40 miles and over 6,000 feet of climbing on high alpine terrain while supporting Crested Butte Nordic.

Take on the Sneffels Round, an epic endurance mountaineering challenge around Ouray, Colorado starting September 5, 2026. Tackle dozens of peaks including Mount Sneffels across rugged, mostly off trail terrain with a 100 hour time limit.

High alpine trail festival at YMCA of the Rockies in Granby, CO offering 5K to 50K races, plus Moosehead and Baby Moose challenge options. Expect dirt singletrack, big climbs and sweeping mountain views for all abilities.