Longmont
Trail Running Calendar near Longmont 2026-2027
Explore the top trail runs near Longmont for 2026-2027! We've gathered 25 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
October 2026
A traditional Backyard Ultra at Luvin Arms Animal Sanctuary on October 24-25, 2026 with hourly 4.167 mile loops, on-site aid, camping, and proceeds supporting the sanctuary.
An approximately 18 mile trail across Boulder's five peaks with about 5,000 ft of climbing on October 24, 2026; limited to 100 participants with a $25 fee donated to recovery.
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
USATF certified one mile dirt loop at Swift Ponds in Fort Collins offering 6, 12 and 24 hour and relay options on Nov 7 and 8, 2026.
Trail races in Louisville, Colorado on November 14, 2026 offering 13.1 miles, 10K and 5K out-and-back courses on dirt trails with aid stations and drop bag service.
A 50K looped ultra near Golden, CO visiting four peaks from Parfet Park with an unmarked, self supported course and no entry fee.
December 2026
A limited 40-runner mountain ascent at Thumb Open Space: repeated 2 km laps with 540 ft gain, poker-chip turnarounds, and patch milestones for 14, 18, and 26 ascents.
Holiday trail runs in Louisville CO with 5k, 10k, a new half marathon, expo pickup, giveaways, family activities, and a visit from Santa.
A 10K at the YMCA of the Rockies on December 19, 2026, with trail and paved sections and nearly 1,500 feet of climbing; breakfast and a day pass included.
February 2027
A winter gravel bike rally and trail run in Lyons, Colorado offering multiple run and ride distances, mixed terrain courses, and a public finish-line party with food and music.
April 2027
Long-distance races on April 11, 2027 along the Poudre River Trail from Bellvue to Greeley with 50 and 100 mile solo and relay options.
May 2027
Trail races near Fort Collins with two distances: 25 miles (~5,500 ft gain) or 50 miles (~11,000 ft gain) on mostly singletrack through Lory State Park and Horsetooth.
Trail races at YMCA of the Rockies on May 22, 2027 offering 10K, 25K, and 50K on mostly runnable singletrack at 8,000 feet; the 50K includes 6,000 feet of gain.
June 2027
Estes Park race weekend on June 20, 2027 features marathon, half marathon, Estes Trail Descent 7.75 miles, Longs Peak 5 mile, kids runs, finisher medals and age group awards.