Trail Running calendar near Boulder 2026-2027

A two-person partner race on Virginia Canyon road in Idaho Springs, CO, held on Valentine’s Day. Runners each complete a roughly 12-mile out-and-back; team time is the sum of both individual times and multiple awards are offered.

Race the Ranch is a unique snowshoe running event near Granby, Colorado. It offers 50K, 25K, and 5K distances across groomed and backcountry trails. All participants must carry snowshoes and receive a beanie and camp mug at the finish.

Trail races on private ranch trails at Sylvan Dale Guest Ranch in Loveland, Colorado over two days in April 2026. Events range from 5K and 10K to 4, 6 and 12 hour timed races plus relay and virtual options.

Mountain Ridge Trail Race in Highlands Ranch, CO features 21 mile, half marathon, 10 km and 5 km courses on mostly dirt single track with rolling hills and front range views. The event uses cupless aid stations and finishes at Mountain Ridg..

A trail ultramarathon on April 12, 2026 along the Poudre River Trail offering 50 mile and 100 mile solo and relay options with stocked aid stations and a post race celebration in Greeley.

Four trail distances plus a virtual option at Greenland Open Space near Larkspur on May 2, 2026, including the 2026 RRCA National 50K Championship. Dirt trails and looped circuits offer Pikes Peak views, aid stations, chip timing and on-sit..

An invitation only endurance trial in Colorado focused on off trail navigation, map and compass skills, and limited aid. The field is capped at 40 and applications open in a short window in January 2026.

Trail races on scenic, well marked singletrack around Fort Collins. Choose a 25 mile loop with about 5,500 feet of gain or run a second loop for 50 miles and roughly 11,000 feet of ascent, with staffed aid stations and enforced cut-offs.

Trail trail race at the YMCA of the Rockies in Estes Park offering 10k, 27k and 55k looped routes. The course is mostly single track with a steep ascent at Bible Point and includes a day pass, a custom hat and wool finisher socks.

Two trail ultras in Buffalo Creek Colorado on May 30, 2026 covering singletrack through pine forest and burn areas. The event offers 50 Mile and 50K options, staffed aid stations, course markings, and a post race festival with awards.

A 20K route around Turquoise Lake in Leadville, CO, running clockwise from Matchless Boat Ramp with paved and single track sections. Adult entry is $40 and under 18 run free. Parking is limited and a day use fee may apply.

The Summits Trail Runs offer a variety of distances on mountain trails at Granby Ranch Resort in Colorado. Courses feature single-track paths through forests, meadows, and aspen groves. This event focuses on community and the natural beauty..

A weekend trail running festival in Mueller State Park offering 100 mile, 100k, 50k and 25k looped races on smooth single and double track. The event includes night running options, crew access at aid stations, shuttled parking for shorter..

A 10k-plus trail run at Devils Backbone Open Space in Loveland, CO, on a looped, flour-marked course with one aid station passed twice. Parking requires a park pass, finishers get a placing token, and awards follow at Loveland Aleworks.

A trail race at Barr Lake State Park in Brighton, CO offering 50K, 30K, half, 15K and 5K on flat, 100% dirt courses with loop and out-and-back formats. The event uses a cupless policy and includes state park parking fees.

Event Overview The Leadville Trail 100 Run Camp is a three-day event scheduled for June 19-21, 2026. It is designed as an introduction and training tool for the Leadville Trail 100 Run. The camp is open to all runners, with group training r..

Multi day mountain bike and trail running festival in Alma, Colorado, June 25 to June 28, 2026. The program includes multiple bike distances, a trail half marathon, an off road duathlon, free kids races and on site camping at 10,600 feet.

Three trail races 5K, 5 mile and 10 mile at Lory State Park near Horsetooth Reservoir and Fort Collins. Courses include aid stations with water and fuel, post race food, a finisher medal and an event shirt.

Trail races in Leadville, Colorado that follow historic mining roads and single track and top out at Mosquito Pass at 13,185 feet. Distances include 26.4 miles and 15.46 miles, with multiple aid stations and on course nutrition.

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.