Trail Running calendar near Frisco 2025-2026

Tackle the legendary Leadville Trail 100, a 100 mile out and back ultramarathon through the high Colorado Rockies with steep climbs, technical singletrack and alpine passes up to 12,500 feet. Expect epic views, serious altitude and belt buc..

Run mountain trails in Fraser, Colorado on August 22, 2026 with a scenic high elevation half marathon or a friendly 5K along dirt roads. All proceeds benefit the Shining Stars Foundation and dogs on leash are welcome.

Staunton Rocks! Marathon and Half deliver high altitude singletrack through Staunton State Park, offering sweeping mountain views, alpine wildlife, and serious vertical gain. With just 150 spots per distance, this rugged trail run fills fas..

Join Rock Hawk Trail Races on August 29, 2026 at Philip S. Miller Park in Castle Rock for scenic rolling trail courses from 5K to 50K. Enjoy friendly aid stations, sweeping ridge views, and the chance to support local open spaces and trails..

Run steep, scenic high country around Steamboat Springs with 5 mile, 16 mile, and 50K options that climb above 10,000 feet. Starts and finishes on the Torian Plum Lawn, with remote aid stations and proceeds supporting trail maintenance.

Run 40 miles across the Elk Mountains from Crested Butte to Aspen along the Grand Traverse route with more than 6,000 feet of climbing. A fundraising point to point ultramarathon with aid stations and a post race shuttle.

Run the Cirque Series at Arapahoe Basin: a scenic 9.4 miles with 2,211 ft of climbing on high alpine trails around Montezuma and Little Lenawee. Finish in Mountain Goat Plaza with live music, food, and festival vibes.

Join the Ned Ned Run in Old Town Nederland, Colorado in September, a 44 year tradition offering road and trail distances from a scenic 5K to a tough half marathon. Family friendly and costumes encouraged; dogs on leash welcome in the 5K.

Run aspen groves and mountain trails at Snow Mountain Ranch in Granby, Colorado on September 12, 2026. Choose 5K to 50K routes on dirt and grass with aid stations and crew support.

Run Rabbit Run in Steamboat Springs, Colorado offers epic 50 mile and 100 mile trail races across high alpine peaks and the Continental Divide. Limited fields, a spirited team challenge and strong charity support make this a must do fall ul..

Race high alpine trails in Crested Butte, Colorado with 50 mile, 55K and 35K options that showcase mountain meadows, ridgelines and fall foliage. Expect big climbs, stunning views and a festival finish with custom swag for all finishers.

Run rugged high alpine trails around Buena Vista, Colorado at the West Line Winder on September 26, 2026, with 30K and 50K options across scenic singletrack and forest roads. Pair with the Sawatch Ascent 50k to take on the Sawatch 50/50 cha..

Test your limits at 24 Hours of Palmer Lake, a low key community driven endurance run atop the Palmer Divide at 7,240 feet. Short loop laps keep the vibe close and the first ten to reach 100 miles earn an on site buckle.

Sawatch Ascent is a mountain 50k in Nathrop, Colorado, around Mount Princeton spanning 33 miles and about 7,000 feet of climbing. Expect long singletrack, big alpine views, and finishers perks like a shirt, medal, and pro photos.

Join the Bear Chase trail running festival Oct 3 to 4, 2026 at Bear Creek Lake Park in Lakewood, Colorado with distances from 5K to 100K on scenic singletrack. Proceeds support Lakewood and Bear Creek open space projects.

Run scenic dirt trails and wide mountain views at the HRCA Wildcat Mountain Trail Races in Littleton, CO. Choose a 10 mile, 10K, or kids fun run and enjoy post race pancakes, medals, and a festive mountain day.

Run the Rubey Rescue Run, a challenging 5K uphill trail in Aspen that climbs to the Cliff House with sweeping Maroon Bells views. Timed and dog friendly, the October race raises funds for the Aspen Animal Shelter.

Explore scenic single track through aspen and pine in the Colorado Front Range at Indian Creek Trail Runs, with distances from 5 miles to 50 miles. Enjoy varied terrain, well stocked aid stations, limited camping and a unique finisher award..

Take on scenic single track and dirt trails at Bear Creek Lake Park with a 5 mile option or a 10 mile double lap and skyline views. Celebrate at the finish festival with a shirt, a finisher mug for 10 mile runners, food and a shoe donation..

Tackle scenic single track trails at Bear Creek Lake Park in Lakewood CO with 5 km, 15 km, a 5 plus 15 double and a kids 1 km. Enjoy race swag and a pancake breakfast amid varied terrain and rolling hills.