Trail Running calendar near Castle Rock 2026-2027

A 10K trail race through Elk Meadow Open Space Park following Pioneer Trail clockwise around the meadow, with downhill sections along Highway 74 and wooded singletrack at the mountain base. The race is cup free and has no aid stations.

A scenic *5 km* cross country race at the Leadville National Fish Hatchery on May 31, 2026, with dirt road, path and trail sections. Awards are given by age group and youth registration is 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..

A multi distance trail running festival in Mueller State Park featuring looped single and double track courses, crew accessible aid stations, and options from 25k to 100 mile at high Colorado elevation.

Aiden's Adventure 5k is a community run/walk honoring a young child's memory. The event features a flat dirt trail 5k, a kids' dash, and family-friendly activities like carnival games and a butterfly release. All proceeds support local char..

A multi-distance running festival at Luvin Arms Animal Sanctuary in Erie, CO, featuring looped off-road courses with mountain views, one central aid station, onsite parking, and races from 5k up to 50 miles plus 3hr/6hr/9hr/12hr timed event..

A looped 10k plus trail run at Devils Backbone Open Space in Loveland featuring marked singletrack, an aid station near mile three served twice, old school timing with a finish stick, and an awards gathering at Loveland Aleworks.

A four race trail series at the Argo trails in Idaho Springs, Colorado, held June to September 2026. Each event is about 5 miles with 785 feet of gain on non technical, runnable trails with visual finish timing.

Looped trail races at Barr Lake State Park in Brighton Colorado offer 50K, 30K, half marathon, 15K and 5K options on dirt surfaces with lake and Front Range views. Aid station coverage varies by distance.

Races through Garden of the Gods Park include a 10 mile road, 10K road and 10K trail, all finishing at Rock Ledge Ranch. The routes pass towering sandstone formations, include aid stations, and end with on-site post-race food and music.

Prepare for the Race Across the Sky at this three day training camp in Leadville. Run key sections of the 100 mile course alongside veteran guides and attend educational panels on nutrition and biomechanics.

A trail race at Garden of the Gods on June 20, 2026, offering 100K, 50K, and 35K courses that feature significant climbing, multiple aid stations, and a start/finish at Rock Ledge Ranch in Colorado Springs.

Experience up to three miles of messy fun at the Colorado National Speedway. Navigate obstacles by crawling wading and sliding through the mud with friends and family during this unique event in Dacono.

Test your strength at this exclusive obstacle course event in Peyton featuring a three lap 3K race and a one mile kids run. Navigate rigs, rope climbs, and heavy carries in a small field of only fifty athletes.

Summer Vibes Bike Rally & Run Festival in Lyons Colorado pairs gravel and road bike rallies with trail running, relays, live music, recovery pools and camping for a combined endurance and festival weekend.

A multi-event Colorado series of four half marathons and a 25K across summer 2026, organized by HAL Sports with races run by local nonprofits. Participants may register for three, four, or all five events.

A community-focused trail festival in Gold Hill, Colorado, with 28K, 12K, 5K and Kids 1K races, a shuttle from Boulder, and proceeds supporting wildfire preparedness for the town.

Experience a high altitude outdoor festival in the highest incorporated town in North America featuring trail running mountain biking and duathlon. Enjoy a weekend of racing and meadow camping surrounded by 14,000 foot peaks.