Lace up for an unforgettable high-altitude adventure at the Flagstaff Sky Peaks Mountain Runs on September 26, 2026, in scenic Flagstaff, Arizona. Known as Arizona's highest footrace, this event offers a diverse range of distances, from a challenging 5K to an epic 50-mile ultra, including 6HR and 12HR fixed-time events new for 2026. Set against the stunning backdrop of the Coconino National Forest, runners will experience breathtaking climbs topping out at 11,500 feet at the Arizona Snowbowl ski resort, with the main races starting and finishing at the Agassiz Lodge.

The Flagstaff Sky Peaks Mountain Runs are celebrated for their spectacular and demanding courses. Runners will navigate a mix of single-track trails along the Arizona Trail (AZT) and varied mountain terrain, winding through picturesque Ponderosa pine forests and vibrant aspen groves. Expect quad-busting ascents like the infamous "Powerline Climb" and the rugged "Weatherford Climb," which contribute to the race's reputation for being "challenging enough with the two notable big climbs." The 50-mile distance uniquely circumnavigates the majestic San Francisco Peaks, while shorter distances provide their own thrilling journeys through the high country. Typical race day conditions for late September feature pleasant highs around 70F and cool lows around 39F, with only an 8% chance of precipitation, creating ideal running weather as the aspens display their brilliant golden fall foliage.

Participants consistently praise the stunning scenery and the well-supported race experience, with many highlighting the beautiful views of the mountains and the dedication of the volunteers. Aid stations are strategically placed, though some distances may have longer stretches between stops, making personal preparedness crucial. Drop bag access is available for longer distances, and pacers are permitted at designated aid stations for the 50M and 50K events. Be ready to bring your own reusable cup, as the event is often cupless, demonstrating a commitment to minimizing its environmental footprint. Whether you're tackling your first mountain 5K or pushing your limits in a 12-hour challenge, the Flagstaff Sky Peaks Mountain Runs offer an unforgettable adventure in one of Arizona's most spectacular trail running destinations.