Trail Running calendar near Marble 2025-2026

The Leadville Trail 100 Run is a legendary 100 mile ultramarathon in the Colorado Rockies that tests runners at high altitude with climbs to Hope Pass and sweeping mountain trails. Iconic belt buckles await finishers who make the 25 or 30 h..

Challenge yourself on the Cirque Series at Arapahoe Basin on September 5, 2026 in Keystone, Colorado. This scenic 9.4 mile mountain course with 2,211 ft of climbing delivers steep, technical trail and big alpine views in a capped field.

Epic point to point ultramarathon from Mt Crested Butte to Aspen across the Elk Mountains. Tackle 40 miles and over 6,000 feet of climbing on high alpine terrain while supporting Crested Butte Nordic.

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.

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 high alpine trails at Crested Butte Ultra in Colorado on September 26, 2026, with 50 Mile, 55K, and 35K options that climb to breathtaking views. Expect rugged singletrack, cupless aid stations, and memorable finisher swag.

Run rolling single track and forest roads around Buena Vista, Colorado, with sweeping Collegiate Peaks views. Choose a 30K or 50K and soak up 14er Fest vibes with camping, live music and local vendors.