Longmont
Trail Running Calendar near Longmont 2026-2027
Explore the top trail runs near Longmont for 2026-2027! We've gathered 27 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
August 2026
A community running event in Allenspark with a timed 5K, a 2K walk/fun run, dog entries for $5, and proceeds supporting The Old Gallery.
Free timed 5K in Lafayette at Waneka Lake with nearby parking; strollers allowed, dogs restricted, and concessions and T shirt sales support the Centaurus Cross Country Team.
September 2026
A multi day ultra on a 2 mile loop in Loveland offering time based and distance races with round the clock aid and on site camping.
Join the community for a 5K run or walk on a brand new dirt course at the North Arvada Middle School Athletic Complex. Support local high school racers before taking on this off road route yourself.
Multi-distance running weekend in Longmont, CO on a flat 1.05-mile loop, offering in-person and virtual options plus awards and on-site aid.
Community 5K, 1 mile fun run and a dog friendly 3.1 mile course on Second Creek Trail supporting Every Child Pediatrics in Commerce City on 09/19/2026.
A two-day trail and bike event in Estes Park featuring 31-mile bike and run options, a 15-mile heavy half, and a 62-mile duathlon, with rugged trails, significant climbs, and aid stations supporting competitors.
October 2026
A scenic 5K through Estes Park during Elk Fest with shuttle transport from the Visitor Center and a finish at Performance Park.
An Oktoberfest themed run in Louisville Community Park with 5k, 10k, half marathon and a kids mile, featuring a traditional German beer mug, a large pretzel, a finisher medallion and an afternoon beer garden with live music.
Repeated 4.167 mile mountain loops on trails beside Rocky Mountain National Park where the last runner standing wins $1,000 and 100 mile finishers earn buckles.
Trail marathon and half near Horsetooth Mountain Park featuring Colorado singletrack, rocky sections, fully stocked aid stations, and time limits for each distance.
A backyard ultra at Luvin Arms Animal Sanctuary on Oct 24–25, 2026 with hourly 4.167-mile loops on mostly flat dirt, grass, and gravel plus on-site race camp and cupless aid.
MonsterDASH Louisville on Oct 25, 2026 offers a new half marathon plus 5k, 10k and a kids mile with costume contests, expo, and themed runner perks.
November 2026
Timed 6-, 12- and 24-hour running and relay events on a certified 1.0002 mile dirt loop at Colorado Youth Outdoors Swift Ponds in Fort Collins, with full-service aid every lap and locker-style lodge support nearby.
Trail races in Louisville, Colorado on November 14, 2026 offering Half Marathon, 10K and 5K on out-and-back dirt trails with aid stations and limited onsite parking.
Trail races in Loveland, CO offering a roughly 13-mile half marathon with a 5-hour limit and a shorter 5K on varied, mixed-terrain trails.