Trail Running Calendar Colorado 2026-2027

Event Details The Into the Hills Eltuck 10K is part of a midweek trail series held in August. This particular event takes place on Tuesday, August 11, 2026. The event is held at Lory State Park, specifically at the Eltuck Picnic Area in Bel..

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.

A 100-mile mountain ultramarathon in Colorado's San Juan Range. The high-elevation course averages 10,000 feet with over 20,000 feet of climbing. It features a 38-hour cutoff and packet pickup in Durango.

Run along Boulder Reservoir on flat, mostly dirt trail courses with sweeping Rocky Mountain views. Choose from 10K, 3 4 marathon, half, full marathon or relay, with USATF certified courses, a shirt and a finisher medal.

Tackle the sustained climbs and technical trails of Roxborough State Park in this late-summer ultramarathon. Choose between the 50K or 50 mile distance on exposed, challenging terrain. Be prepared for hot conditions, spaced aid, and a manda..

Hit the trails at Cheyenne Mountain State Park with this trio of scenic races. Choose from a challenging 25K mountain course, a 10K trail race, or an accessible 5K run/walk. All events support the park and feature chip timing on beautiful s..

Run the trails around Standley Lake in Westminster, Colorado. Choose from five distances, from a 5K to a 50K, on out-and-back dirt routes. Experience a cupless race with scenic views and a festive atmosphere.

The Leadville Trail 100 Run is a legendary 100-mile ultramarathon in the Colorado Rockies. With over 15,000 feet of elevation gain and a summit over 12,500 feet at Hope Pass, it's a massive high-altitude challenge. Finishers within 30 hours..

Experience the high-altitude scenery of Leadville on this 10K course, which follows the first and final miles of the famous LT100 Run. With a single aid station and awards for top finishers, it's a classic mountain run. Registration is open..

A midweek trail 5k at Lory State Park in Bellvue, Colorado, presented as part of an August series. Chip timing, series points and awards, free vintage shirts for registrants, and pizza and beverages after each race.

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.

Run on 100% unpaved trails in the Rocky Mountains near Fraser. Choose between a high-elevation half marathon or a 5K, with leashed dogs welcome. All proceeds support the Shining Stars Foundation.

Staunton Rocks! Marathon and Half Marathon This trail running event takes place in Colorado's Front Range Mountains, southwest of Denver, within Staunton State Park. The course tours the park's renowned singletrack trails, passing by histor..

The Telluride Mountain Run is a technical mountain race in Colorado's San Juans, with routes reaching over 13,000 feet. Runners face rocky, exposed terrain on old mining roads and alpine tundra. This demanding event is not suited for beginn..

Event Overview The Arrowhead Half Marathon & 5K is a trail running event held in Arrowhead, Colorado, as part of the Vail Trail Running Series. The event features two race distances: a half marathon (21.4K / 13.3 miles) and a 5K (5.6K /..

Event Overview The Lory Summer Trail Series consists of four midweek trail races held on Tuesdays in August at Lory State Park near Bellvue, Colorado. Each race is a separate event with a different distance and course profile, ranging from..

Explore the rolling trails of Castle Rock's Miller Park at the Rock Hawk Trail Races. Choose from four distances, from a 5K to a 50K, on a course that supports local trails. The event features aid stations and a festive start/finish area fo..

Experience trail running on the Continental Divide in Steamboat Springs. Choose from 50k, 16 mile, or 5 mile courses in a cupless event supporting local trails. Awards, finisher mugs, and a post-race taco bar await participants.

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.

Event Overview The Front Range Ultra Dayze (FRUD) is a multi-day running festival taking place in Loveland, Colorado. It features a variety of ultra-distance and timed events, with a total participant cap of 200 runners. Distances and Forma..