Trail Running Calendar Colorado 2026-2027

Experience the highest trail marathon in the USA reaching 13185 feet at Mosquito Pass. Choose between a 26.4 mile marathon or a 15.46 mile heavy half through Leadvilles historic mining district and rugged high altitude terrain.

An overnight endurance event in Highlands Ranch, Colorado offering solo and team relay options on a 10.3 miles dirt loop beneath a full moon. Two aid stations, drop bags, medical support and a headlamp requirement are provided.

A Backyard Ultra around Lake Estes where runners repeat 4.252 mile laps on a paved loop until one finishes. The event offers a stocked aid station, a custom hat for participants, and benefits local childcare services.

Experience trail running at the historic Howelsen Hill ski area in Steamboat Springs. Choose between 5k and 10k distances as part of an exciting multi sport race weekend in the Colorado mountains.

Experience a half marathon in the mountains of Nederland Colorado. This event features a significant elevation gain of 4226 feet with the summit always in view.

Celebrate Independence Day with a festive 5k along Pueblo's Arkansas River Trail. This family-friendly event features costume prizes, finisher medals, and post-race activities. Proceeds support the local running community and charitable cau..

Kick off Independence Day with a 5k run/walk in Winter Park, Colorado. The scenic route travels along the Fraser River Trail and finishes at the Rendezvous Event Center for a post-race party.

A July 4 5K in downtown Leadville held above 10,000 feet, with adult and youth entries and proceeds supporting local youth athletics and recreation.

Experience a mountain run to the summit of an 10,839 foot former volcano. This 8 mile out and back course features 2200 feet of climbing and panoramic views from a historic fire lookout tower.

Celebrate 50 years of history at the Vail HillClimb, a 12.2 km mountain race gaining over 2,000 feet of elevation. Run from Vail Village to the scenic Mid-Vail finish line for incredible views and commemorative awards.

Experience high altitude trail running through historic Colorado ghost towns and mines at over 10000 feet. Choose from distances ranging from 10 miles to 100 miles in the scenic South Park Valley.

A 100 mile clockwise loop in the San Juan Mountains around Silverton, Colorado, with about 33,000 feet of climb and alpine terrain topping Handies Peak above 14,000 feet. The route passes near Silverton, Lake City, Ouray, Telluride and Ophi..

Experience Crested Butte's oldest trail challenge with 15k and 25k runs or a technical 25k mountain bike race. Navigate scenic singletrack and alpine ridges finishing with a post race brunch.

Experience an endurance challenge through historic Colorado mining districts with the Silver Rush 50 Run. Choose between 50 mile, 15 mile, or junior 5k distances while competing for a qualifying spot in the Leadville Trail 100.

A 100 mile mountain ultramarathon in Ouray, Colorado, with 41,862 feet of elevation gain, mandatory pre-race volunteer service or a $100 opt out fee, live SPOT tracking, cash prizes subject to drug testing, and a steep final climb to the Br..

Experience a high altitude 100 mile loop through the Colorado Rockies featuring 23,300 feet of gain. Run across alpine passes and historic ghost towns on the Continental Divide and Colorado Trails within a 37 hour limit.

Experience a high altitude trail adventure through Colorado's San Juan Mountains. Run past historic ghost towns and reach heights of over 12,900 feet on the scenic Alpine Loop.

A mountain trail race at Powderhorn Mountain Resort on July 18, 2026 offering a steep 5K with over 1,500 feet of climb and a 15K that repeats the ascent. Registration includes resort entry, shirt, finisher item, food, and a lift pass.

Run through Aspen trees and wildflowers on the scenic Spring Creek Trail in Steamboat Springs. Choose between a challenging 9.5 mile loop with significant elevation gain or a rolling 5k out and back course.

Experience the mountain trails of Aspen Snowmass with three distinct race distances. Runners can choose between a 50K trek across four mountains a 25K trail run or a 10K course starting from the Elk Camp Gondola.