Trail Running calendar near Allenspark 2026-2027

Backyard Laramie on April 18, 2026 is a free backyard ultra at Pilot Hill Recreational Trailhead where runners repeat 4.17 mile gravel loops hourly until one remains; donations support local trail maintenance.

The Great Western Trail Race, a BOLDERBoulder qualifier in Severance, Colorado, is not scheduled for 2026 but may return. It has featured 5k, 10k, half marathon, and kids run distances. The event supports local community foundations and non..

Trail races at Greenland Open Space in Larkspur, Colorado offer 4 mile, 8 mile, 25K and 50K distances on dirt double-track trails with aid stations and championship designation for the 50K.

Niwot's Challenge is an invitation-only navigational ultrarunning trial near Sedalia, Colorado. Entrants must use map and compass, carry mandatory gear, and complete long off trail loops with minimal aid.

Experience the 45th annual run along the scenic High Line Canal in Centennial. Enjoy chip timed 5K or 10K races followed by a pancake breakfast and beer garden.

Join the Aurora community for an untimed 1k fun run or a timed 5k race ending with an optional muddy obstacle course. This rain or shine event welcomes runners and walkers of all ages.

Experience the rugged beauty of the Rocky Mountain foothills in Fort Collins with a 25 or 50 mile trail race through Lory State Park and Horsetooth Mountain Park featuring significant vertical gain and scenic ridgeline views.

A community trail event in Kittredge featuring a 7.4 mile route through private land and O'Fallon canyon trails, plus a kids run where children run one lap per year. Manual timing, staggered cohort starts, and a post-race park gathering.

Trail races in Eagle, Colorado on May 16, 2026 offering a **14K** and **6K** on mostly single-track with notable elevation gain, finish-line food, aid stations with Skratch hydration, and awards plus an afterparty at Capitol Public House.

Samson's Revenge is a trail race at the YMCA of the Rockies in Estes Park offering 50k, 25k and 10k options. The course uses a roughly 10 km loop with a prominent Bible Point ascent and two aid stations.

Test your endurance at this Golden Colorado event following the classic backyard format with 4.17 mile laps every hour. Support the Sun Valley Kitchen and Community Center while pushing for your personal best distance.

A weekend running festival in Eaton, Colorado offering distances from 7K to 100 miles, relay teams and 36 hour options on a 2 mile groomed dirt loop, with on-site camping, glamping and amenities such as sauna, cold plunge and aid stations.

A mountain trail ultramarathon in Buffalo Creek, Colorado, offering **50 Mile** and **50K** singletrack courses on soft surfaces with aid stations, marked trails, and finisher awards.

A historic trail race near Laramie offering a rugged 25K and a new 10K option, scenic summit views, two aid stations, and a cupless format. Proceeds support Pilot Hill Inc.

A 20K run clockwise around Turquoise Lake near Leadville, CO, mixing 6.5 miles of hilly paved road with 5.5 miles of single track trail, with proceeds supporting Leadville youth athletics and a nominal day use parking fee.

A 5k trail race through the rolling hills of Elk Meadow Park in Evergreen, Colorado, with vendor tents, rec trailer activities and refreshments. The course is cup free and has no aid stations, with marshals on course.

A 5K trail run at the Leadville National Fish Hatchery with a cross country style route through subalpine forest around Evergreen Lakes and lower Rock Creek. Adults $15; youth 17 and under free.

A Parker, CO trail event with a Dipsea style staggered start, a rolling, partly technical 10k and a kids 1 mile. No race day registration; volunteers may race for free and a top-10 podium and awards are given.

Six trail races across Summit County, Colorado, in summer 2026. Series registration includes long and short course options with adult, youth, and non binary categories and events at multiple Summit County trail heads.

Trail races at Granby Ranch Resort in Colorado offer multiple distances including a 14 hour Elevation Challenge based on completed loops. The combined field is capped at 250 and the event includes aid stations, drop bag options, and on-site..