Elden Ridge Run

Elden Ridge Run takes place in Flagstaff, Arizona, on October 17, 2026. There is one format, a 12.6-mile trail race (20.3 km) starting at 7 a.m., with registration handled through UltraSignup. The name points to Mount Elden, the peak that rises directly above Flagstaff, and the town itself sits at around 7,000 feet.

Altitude is the story on this one. Runners coming from lower elevation should expect their usual half marathon pace to feel considerably harder, and the sensible response is to race by effort rather than by watch. Arrive a day or two early if your schedule allows. The distance itself is manageable for anyone with a regular running habit, but a build that includes sustained climbing rather than flat mileage will pay off, and hiking the steepest sections is a normal tactic here, not a concession.