January ultramarathons in Arizona, United States

Rolling singletrack through saguaro-studded Sonoran desert, with the steep, rocky Goldmine climb and wide-open views in San Tan Mountain Regional Park.

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

Fast 50K route through McDowell Mountain Regional Park, with gently rolling Sonoran Desert trails and wide-open views near Fountain Hills.

Looped 4.1667-mile course through Usery Mountain Regional Park, shifting from rugged trails by day to an out-and-back road at night, with timed hourly starts

50-mile paved route on Tucson’s Loop, starting and finishing at Rillito Park via parks, greenways, and river corridor washes

Rugged singletrack through Oracle State Park and remote Arizona Trail, constant elevation changes, Santa Catalina Mountain views