Desert Solstice

Desert Solstice takes place in Phoenix, Arizona, on December 19, 2026, and is aimed squarely at ultrarunners. Four formats are on the program: a 100-miler, a 100K (62 miles), a 50-miler, and a 24-hour event where the goal is total distance rather than a fixed finish line. Start times are not listed, so confirm them with the organizers before you plan your travel.

These are serious undertakings that need months rather than weeks of preparation, built on back-to-back long runs and a nutrition plan you have rehearsed. The 24-hour format in particular is a different discipline from a fixed-distance race: pacing, eating, and time off your feet all count against your total. If you are stepping up, the 50-miler is the natural entry point before attempting 100.