Wyoming · Dayton

Bighorn

Qualifier status per the 2026 lists

The Bighorn 100 was born in 1993 from a conservation campaign by Sheridan-area trail runners trying to block a hydroelectric project in the Dry Fork and Little Bighorn River canyons — the race itself was the publicity strategy. The 100-mile distance arrived in 2002; the course puts 20,500 feet of gain across canyon descents, limestone cliff traverses, and high meadows in the Bighorn National Forest. In wet years the mud defines the race: shoe-sucking throughout, deep enough in one edition to swallow a horse on course.