Trail Running calendar near South Fork 2026-2027

Join the Durango Running Club for a 5K fun run and walk along the Animas River Trail. This zero waste event supports immigrant services and kicks off the local Earth Day festival and parade.

Run the Sky Pilots Ouray Backyard Ultra in Fellin Park, completing a 4.167 mile loop each hour until one runner outlasts the field. Enjoy riverside trails, mountain views near 7,700 feet and shared aid.

A roughly 14 mile loop around Vallecito Reservoir in Bayfield, Colorado, combining paved road, dirt road and singletrack with about 1,000 ft of climbing. The event features four aid stations, a cupless policy and a post-race meal with live..

A last-person-standing ultra on Durango's Spurline trails. Run a 4.17-mile loop every hour until only one runner remains. All proceeds support local trail building and maintenance.

A 50 mile mountain trail run in Lake City, Colorado on June 20, 2026 held as a benefit for Lake City EMTs. The course includes high alpine terrain with snowfields and creek crossings and requires prior ultra experience and a registered trac..

A mostly off-trail mountain traverse near Silverton, CO—about 50 km with 19,000 ft ascent, unmarked navigation, limited support, and entry limited to qualified Sky Pilots members with a 19-hour cutoff.

A 100 mile clockwise loop through the San Juan Mountains near Silverton, Colorado, covering about 33,000 feet of ascent and reaching over 14,000 feet. The 2026 route passes near Silverton, Lake City, Ouray, Telluride and Ophir.

A 100 mile mountain ultramarathon in Ouray, Colorado, featuring about 41,862 feet of elevation gain and 14 climbs. Entrants must complete volunteer service or pay a $100 opt out; top finishers face drug testing for cash prizes.

Experience a high altitude 100 mile loop through the Colorado Rockies featuring 23,300 feet of gain. Run across alpine passes and historic ghost towns on the Continental Divide and Colorado Trails within a 37 hour limit.

Experience a high altitude trail adventure through Colorado's San Juan Mountains. Run past historic ghost towns and reach heights of over 12,900 feet on the scenic Alpine Loop.

Experience a historic high altitude climb in Silverton Colorado featuring a 12 mile summit run and an 11 km course. Scale Kendall Mountain and take in views of the San Juan Mountains in this classic mountain tradition.

An ultra running event in Creede offering 50 mile and 100 mile courses across the San Isabel and Rio Grande National Forests over two days, organized by Tempest Adventures under a USDA Forest Service permit.

Mountain trail races in Telluride, Colorado offering a high alpine 30K with about 5,800 ft of gain and a 10 mile with about 3,500 ft of gain, both on mixed double track and singletrack with alpine views.

A non-profit 15-mile trail race on August 1, 2026 near Hesperus, Colorado, climbing 3,100 ft to 12,200 ft at Kennebec Pass with views of the Animas and Dolores valleys. Proceeds benefit La Plata County Search & Rescue.

A self guided 100 Miler around Lake City, CO that requires visiting 24 proof points and checkpoints in order. The course is unmarked and unsupported and must be completed within 48 hours.

A high altitude 100 mile mountain ultramarathon near Durango, Colorado on August 14, 2026. The course runs above 10,000 feet with about 19,000 feet of climbing and a 38 hour cutoff.

A technical mountain race above Telluride, Colorado, offering five routes from a hill climb to 65 miles, with high-altitude ridgelines and rocky, exposed terrain; intended for experienced mountain runners.

A 50 mile mountain ultramarathon in Ouray, Colorado with 23,582 feet of ascent on technical high elevation trails. Runners must meet a volunteer service requirement or pay a $100 opt-out; SPOT tracking and drug-tested cash prizes.

Trail running in Creede, Colorado with 50K, 22 mile, 12 mile and 2 mile courses through the historic mining district and near the Continental Divide. Several courses include specific cutoff locations and time limits.

A demanding 17.1 mile mountain trail race connecting Ouray and Telluride over the high altitude Imogene Pass. This event features steep rocky terrain and strict cutoffs for prepared athletes.