Trail Running calendar near Fort Collins 2026-2027

Alpine ultramarathons in State Forest State Park offering a 100 km and 60 km trail courses with large elevation gain, high ridgelines, stocked aid stations and limited cell service.

Held July 25, 2026 in Conifer, Colorado, the Elevation Run/Walk offers a 10K, a USATF certified 5K and a 2 mile fun run while raising funds for local school boosters and leading into the Elevation Celebration festival with music and vendors..

The Evergreen Trail Race Series will take place in Evergreen on Saturday 25 July 2026. You can run between 5 and 10 miles.

An overnight team relay covering 200 miles and 36 legs from Fort Collins to Steamboat Springs, crossing two mountain passes. Multiple team categories are offered and teams choose between supplying volunteers or donating to Windsor Gives.

A mountain trail event in Winter Park, CO offering 50K, 21K, and 10K courses across high alpine singletrack with significant elevation gain, staffed aid stations, age group awards, and town finish at Rendezvous Event Center.

Two Brothers Up and Down in Idaho Springs offers two uphill out and back races on mixed dirt and paved roads, with steep sections and an aid station on the 10k. Both races start and finish at Courtney Riley Cooper Park.

A four-race midweek trail series at Lory State Park in August 2026 offering 5k to 12k courses, timed by chip with series points and end of series awards. Pizza and beverages follow each race and vintage shirts are available.

A hilly 10K trail race at Lory State Park in Bellvue, Colorado, featuring about 1,700 feet of elevation gain, a 100-runner cap, chip timing, and post-race pizza and beverages as part of a midweek series.

A four‑race midweek trail series at Lory State Park in August 2026 offering 5k, 10k and 12k courses with varied elevation. Series and per-race registration, post-race food and drinks, and end-of-series awards for top points scorers.

Run the scenic Medicine Bow Rail Trail and Lake Owen at high elevation in Wyoming's national forest. This event offers both marathon and half marathon distances, all on a historic pathway. The 2026 edition is scheduled for August 15.

A mostly dirt and trail race along Boulder Reservoir in Boulder, Colorado, with about 200 feet of elevation gain. Distances range from a 10K to a full marathon, plus a relay option.

Trail ultras from Roxborough State Park to Sharptail Trailhead featuring sustained climbs, technical singletrack, and a long runnable finish, with full aid support and an emphasis on land stewardship.

Trail races around Standley Lake in Westminster, CO, with five distances on packed dirt trails and lake and mountain views. Organized by Aravaipa Running; registration closes Aug 10.

Summit Grays and Torreys Peaks in this 8.8 mile Colorado endurance event. Participants must carry a 20lb dry load while tackling 4,101 feet of elevation gain.

A hilly trail 5k at Lory State Park on August 18, 2026 with about 700 feet of elevation gain, a 100-runner cap, chip timing, and pizza and beverages provided after the race.

A four‑race midweek trail series at Lory State Park in August 2026 offering 5k, 10k and 12k courses with varied elevation. Series and per-race registration, post-race food and drinks, and end-of-series awards for top points scorers.

The Rocky Mountain Milestone Challenge will take place in Granby from Wednesday 19 August 2026 to Sunday 23 August 2026. You can run between 13 and 100 miles.

Trail-based chip timed half marathon and 5K near Fraser, Colorado, on unpaved roads and trails, with aid stations and proceeds supporting the Shining Stars Foundation.

A trail race at Staunton State Park offering 26.3 mile and 13.1 mile courses over mostly singletrack with significant elevation gain, well marked trails, capped fields, and fully stocked aid stations.

Trail races at Curt Gowdy State Park near Cheyenne, Wyoming, across granite boulders, pine forests and open meadows. Distances include a 4 mile and an 8 mile, with a half marathon planned for 2027; the event is cupless with aid stations.