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Ultra Marathons
50K and beyond, into the dark. Filter, sort and register.
Discipline Guide
An ultra marathon is any race longer than the classic 26.2-mile marathon distance, and the discipline stretches from 50K road races to mountain 100-milers and multi-day stage events. The Kinetic Chronicle lists the full spectrum, including 50K, 50-mile, 100K and 100-mile distances as well as timed 12- and 24-hour fixtures and backyard-ultra formats where the last runner standing wins. Typical distances start at 50K (31 miles) and climb well beyond 100 miles on technical trail, with elevation gain often measured in the tens of thousands of feet. Notable events in the directory include legendary Western States-style 100-milers, Hardrock-caliber high-altitude mountain races, flat-and-fast desert 50Ks and the growing circuit of backyard ultras. Filter by state, date or distance to find your next long day in the dirt and register straight with the race director.
What distance counts as an ultra marathon?
Any race longer than 26.2 miles (42.195 km) is an ultra marathon. The most common distances are 50K, 50 miles, 100K and 100 miles, alongside timed 12- and 24-hour events and backyard-ultra formats.
Do ultra marathons have cutoff times?
Nearly every ultra has cutoff times at the finish and at intermediate aid stations, typically ranging from 30 hours for a 100-mile race down to 12 hours for a 50-mile. Cutoffs are set for runner safety and course logistics, so check the race's athlete guide before registering.
How do aid stations work at an ultra marathon?
Most ultras offer fully stocked aid stations every 5-10 miles with water, electrolytes, hot food, salt, first aid and sometimes a crew drop-bag area. Some mountain 100-milers also provide medical checks and mandatory gear inspections at key checkpoints.
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