Flagstaff to Grand Canyon Stagecoach Line 100 mile Ultra & Relay

Flagstaff to Grand Canyon Stagecoach Line 100 mile Ultra & Relay takes place in Flagstaff, Arizona, on September 19, 2026. The event has three formats: a 100-mile trail run, a 55K (34 miles) trail run, and a 100-mile mountain bike race, plus relay options as the name indicates. According to the website, the event is connected with the Arizona Trail Association.

The 100-mile run is a point-to-point ultra at altitude, since Flagstaff sits at around 7,000 feet, and it belongs on the calendar of runners with previous 100K or 100-mile experience. The 55K is a more approachable way to sample the high-country trails and works as a first ultra beyond 50K. Runners coming from lower elevations should arrive early or, at a minimum, start cautiously. A 20-week build with back-to-back long runs, plenty of hiking practice and heat and altitude acclimatization is a sensible plan for the 100-mile. Relay teams should organize handoffs and crew logistics well in advance.