100K ultramarathons in Arizona, United States in 2027

Desert singletrack and foothill paths in Estrella Mountain Regional Park, with Sonoran scenery and 100K or 100-mile options.

Rugged Sonoran Desert point-to-point on the scenic Black Canyon Trail, single track and stagecoach paths, challenging climbs in the second half

100K point-to-point from Sonoran Desert lowlands to Mount Lemmon’s alpine forest, with steep climbs, rugged descents, and sweeping ridgelines