Trail Running calendar near South Fork 2025-2026

Run the Rio Frio 5k on the frozen Rio Grande in Alamosa, CO, with San Juan and Sangre de Cristo views and chip timing. Embrace the icy course with traction footwear and chase ice themed awards in this one of a kind winter race.

Pine Needle Langlauf at Durango Nordic Center offers freestyle Nordic racing on scenic, challenging terrain across multiple distances. Finish the Southwest Nordic Race Series with live music, awards and participant schwag.

Join the 21st Run Through Time in Salida, Colorado on March 14, 2026 for scenic high elevation trail races: marathon, half, and 2 mile. All registered runners get custom socks and proceeds benefit local trails and search and rescue.

Race the Sky Pilots Ouray Backyard Ultra in Fellin Park on May 16, 2026. Complete a 4.167 mile loop each hour until one runner outlasts the rest, with scenic river walk views and supportive aid station service.

San Juan Solstice 50 Mile Run is an ultramarathon scheduled for June 20, 2026. The event features a 50-mile course, with a dedicated course info page and an alternate course option, underscoring a challenging yet community-focused atmospher..

The John Cappis is a challenging endurance peakbagging event held near Silverton, Colorado, featuring a roughly 50k course with about 19,000 feet of elevation gain. Participants summit multiple peaks in the rugged San Juan Mountains, naviga..

Experience the legendary 100 mile Hardrock Hundred in Colorado's San Juan Mountains, a rugged high altitude loop through Silverton, Telluride and more. Expect massive climbing, alpine scenery and a coveted lottery entry for 2026.

High Lonesome 100 is a rugged 100 mile mountain loop in Colorado, crossing five alpine passes and sections of the Continental Divide and Colorado Trail. Mid July racing delivers big climbs, sweeping alpine views, and a true endurance test.

Ouray 100 is a 100 mile mountain ultramarathon in the San Juan Mountains on July 17 2026, with 14 climbs and a final ascent to the Bridge of Heaven. Finish at Fellin Park by the hot springs and earn a belt buckle.

The Silverton Alpine Runs on July 18, 2026 offer 50K, marathon and 8 mile courses from Silverton Memorial Park in the San Juan Mountains. Run jeep road loops past historic ghost towns and climb to California Pass near 12,930 feet for sweepi..

High alpine challenge in Silverton, Colorado on July 19, 2026 with 12 mile and 11K options starting downtown and finishing at Memorial Park. Tackle steep jeep road climbs and a summit scramble on the 12 mile while enjoying rugged mountain v..

Tackle a scenic 15 mile high altitude trail to Kennebec Pass with sweeping river valley views and alpine wildflowers. Limited to 150 runners and benefiting La Plata County Search and Rescue, this intimate mountain run rewards effort with ho..

High Five 100 is a self guided mountain challenge from Lake City, Colorado: roughly 90 to 105 miles with about 40,000 ft of climbing and summiting five 14ers. Finish the unmarked route within 48 hours; registration opens January 1, 2026.

Take on the Sneffels Round, an epic endurance mountaineering challenge around Ouray, Colorado starting September 5, 2026. Tackle dozens of peaks including Mount Sneffels across rugged, mostly off trail terrain with a 100 hour time limit.

Take on the legendary Imogene Pass Run in Telluride, a brutally beautiful mountain race for well prepared athletes. Limited field and strong community support make this epic high country challenge as rewarding as it is demanding.

Enjoy a challenging 13 mile trail run in breathtaking Ouray, Colorado, starting and finishing at Fellin Park. This community fundraiser supports the Ouray School and helps fund student trips, with free entry for local students and staff.

Experience the Sangre de Cristo Trail Festival near Westcliffe, Colorado in late September, featuring trail races from 8 miles to 100 miles on the Rainbow Trail. Camping on site and finisher awards add festival atmosphere while 100 mile fin..