Trail Running Calendar Colorado 2025-2026

Ring the Springs offers 35K, 50K and 100K trail distances through Garden of the Gods and Pike National Forest, starting at Rock Ledge Ranch. Expect big climbs, varied terrain, aid stations and stunning mountain views.

The John Cappis is a challenging endurance peakbagging event held near Silverton, Colorado, featuring a roughly 50k course with about 19,000 feet of elevation gain. Participants summit multiple peaks in the rugged San Juan Mountains, naviga..

Run scenic trails at Lory State Park with sweeping views of Horsetooth Reservoir and the foothills. Choose from 10 mile, 5 mile or 5K courses at a USATF sanctioned, 100% plant based event with aid stations and medals.

Race in the Clouds at Alma Cemetery Meadow is a high country weekend of mountain bike, trail and off road duathlon racing at 10,600 feet. Multiple distances, youth events and on site camping create a true alpine festival vibe.

Run the Life Time Leadville Trail Marathon or Heavy Half on June 27, 2026, tackling high alpine singletrack and dirt roads through historic mining country up to Mosquito Pass at 13,185 feet. Expect a challenging, possibly snowy race with fu..

Celebrate July 4 with Pueblo's Firecracker 5k along the Arkansas River Trail in City Park. Family friendly fun with music, Kona Ice, costume contests and proceeds supporting local running and youth grants. Medals for the first 350 finishers..

High Trails Trail Running Retreat in Buena Vista Colorado, July 9 to 12, 2026 offers guided trail outings of 10 to 20 miles and a possible group ascent of Hope Pass. Expect coaching, shared meals, and stunning mountain views.

Explore alpine single track at the Silverheels Trail Runs in Como, Colorado on July 10 and 11, 2026, with distances from 10 miles to 100 miles. Limited entries, stunning mountain views, and a buckle for 100 mile finishers.

Hardrock Hundred is a legendary 100 mile ultramarathon across Colorado's San Juan Mountains, testing runners with high alpine terrain and massive elevation gain. The clockwise 2026 loop links historic towns like Silverton, Telluride and Our..

Run or bike alpine singletrack to Green Lake at Grin & Bear It in Crested Butte on July 11, 2026. Choose loop or out and back distances that climb above 10,000 feet for huge views and a fast descent to town.

Join the Life Time Silver Rush 50 Run in Leadville for a high alpine 50 mile out and back plus 15 mile and 5K juniors. With seven aid stations and Leadville Trail 100 Run qualifier spots, this is a true mountain challenge.

Ouray 100 is a 100 mile mountain ultramarathon in the San Juan Mountains on July 17 2026, with 14 climbs and a final ascent to the Bridge of Heaven. Finish at Fellin Park by the hot springs and earn a belt buckle.

High Lonesome 100 is a rugged 100 mile mountain loop in Colorado, crossing five alpine passes and sections of the Continental Divide and Colorado Trail. Mid July racing delivers big climbs, sweeping alpine views, and a true endurance test.

Run the Silverton Alpine Runs through Colorado high country, visiting ghost mining towns and reaching near 12,926 feet at California Pass. Choose 8 mile, marathon or 50K distances and add the Kendall Mountain race for a mountain weekend.

Take on the Barr Trail Mountain Race in Manitou Springs, Colorado, a rugged 12.6 miles up to Barr Camp on Pikes Peak terrain and back to the trailhead. Part of the Garden to Peak Challenge, this summer favorite fills fast so register early.

Run three unforgettable stages across the Continental Divide near Leadville, Colorado, with epic fourteener views and campsite camaraderie each night. Choose the 51 mile Full Pint or 35 mile Half Pint, with limited entry for 500 runners.

Run high alpine trails in Silverton, Colorado with the historic Kendall Mountain Run, offering a summit 12 mile challenge and a shorter 11K to Deer Park. Expect steep climbs, stunning views, and old mining town charm.

Take on the Never Summer trail ultras near Gould, Colorado, with 60 km and 100 km routes across high alpine ridges, lakes and rugged terrain. Expect big climbs, wildlife sightings and a true mountain adventure.

Pikes Peak Ultra on July 25, 2026 in Colorado Springs offers 20K, 30K, 50K and 50 mile options across scenic trails with big climbs and summit views of Pikes Peak and Mt Rosa. All finishers get a custom shirt, BOCO trucker hat and medal.

Creede 100 returns to Creede on July 25 to 26, 2026, offering a spectacular mountain trail challenge for adventurous runners. Organized by Tempest Adventures under a USDA Forest Service permit, the event promises well supported racing throu..