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The 100-Mile Party Run. Five clockwise loops through McDowell Mountain Regional Park in the Sonoran Desert. Loop 1 includes the Escondido Trail extension (22.3 mi total), while Loops 2–5 follow the standard 19.45-mile circuit via the Pemberton, Shallmo Wash, and Cinch Trails.
Aid stations at Coyote Camp (mi 4), Jackass Junction (mi 10.5), and Rattlesnake Ranch (mi 15.7). Cutoff: 6:00 AM Sunday — must start Loop 5 by 24 hours.