Trail Running calendar near Larkspur 2026-2027

A trail ultramarathon in Colorado Springs with 20K, 30K, 50K and 50 mile options that start and finish at Bear Creek Regional Park. Courses use local granite trails, include high elevation sections, and operate cupless aid stations.

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..

A combined national high school trail championship and a citizens race on the Salida Mountain Trails in Salida, Colorado on July 25, 2026. The 5.4 mile singletrack course includes steep climbs, switchbacks and a high point near 7,558 ft.

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

Annual pack burro race in Fairplay Colorado offering a long mountain course to Mosquito Pass and a shorter wooded loop. Each runner must be paired with a burro and meet specific pack equipment requirements.

A single 200 mile loop around Summit County Colorado across high mountain trails and forest roads, with about 40,000 feet of elevation change, live GPS tracking, 12 aid stations and a small capped field of runners.

STRS #4 - Tom's Baby on July 29, 2026 takes place at Tom's Baby Trailhead in Breckenridge, CO, offering short and long course entries with adult, youth, and non-binary categories and published entry fees.

Sheep Mountain Trail Runs in Fairplay Colorado features 50 mile, 50K and Half Marathon courses on high‑elevation mountain trails with maps, aid stations, and midrace drop options.

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 pack burro race in Buena Vista Colorado on Aug 2 2026 with 13.1 mile and 7.3 mile courses offered both with and without burros. Burro teams must meet specific equipment and conduct rules and finishers receive a gift and a meal.

Trail races of 5K, 10K, and half marathon on Frisco Peninsula trails with lakeshore finishes at Dillon Reservoir on August 8, 2026.

The 21st Annual Reece's Roundup is a trail event in Castle Rock featuring a 5K and a 1 Mile Walk, with proceeds supporting a benefit fund that helps a family manage the care needs of a young person with spinal muscular atrophy.

Trail run at Rampart Reservoir with 8 mile and 16 mile options on single track and rocky sections. Entry is limited to 150 and registration closes August 5, 2026.

A traditional pack-burro race in Leadville, Colorado at over 10,000 feet where each team is one runner and one burro carrying mining tools. The long course is about 21 miles and a shorter 6 to 8 mile course is planned.

STRS #5 Carter Park Scurry in Breckenridge on August 12 2026 offers short and long course entries across adult youth and non-binary divisions with published entry fees and a course map.

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.

Experience the trails of Cheyenne Mountain State Park with three race distances ranging from a 5K walk to a 25K mountain challenge. This chip timed fundraiser supports park conservation through scenic and high elevation courses.

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.