Trail Running calendar near Jackson County 2025-2026

High altitude trail running in Fraser, Colorado on August 22, 2026, with a scenic half marathon through dirt roads and trails and a 5K around the rodeo grounds. Proceeds support the Shining Stars Foundation for children with cancer.

Front Range Ultra Dayze invites ultrarunners to a multi day looped trail festival along River's Edge in Loveland, Colorado, offering timed and distance events from 12 hour to 200 mile. Enjoy scenic two mile loops, around the clock aid, camp..

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.

Ned Ned Run in Nederland Colorado blends scenic trail and road running through the foothills, offering a half marathon, 10K and fun 5K for all abilities. Family friendly and costumes encouraged, with leashed dogs welcome in the 5K.

High alpine trail festival at YMCA of the Rockies in Granby, CO offering 5K to 50K races, plus Moosehead and Baby Moose challenge options. Expect dirt singletrack, big climbs and sweeping mountain views for all abilities.

Run Rabbit Run in Steamboat Springs is a mountain trail ultramarathon offering 50 mile and 100 mile courses with big climbs and sweeping alpine views. High elevation and strong charity ties make it a must do fall event.