Ultratrail

Ultratrail is a form of long-distance running conducted on natural trail courses longer than a standard marathon. Distances typically start at about 50 kilometers and extend to 100 miles (160 kilometers) or more, often with substantial elevation gain and technical terrain. Courses traverse mountains, forests, deserts, and remote landscapes, demanding endurance, navigation, and self-sufficiency from participants.

Races are usually timed events with predefined finish cutoffs. Aid stations provide food and fluid, but runners generally carry or stash their own supplies. Many ultratrails include mandatory equipment and safety checks, such as weather-appropriate outerwear, insulation, lighting, and signaling gear. Depending on the course, navigation may be fixed on marked trails or require map and compass use.

Training for ultratrail emphasizes high weekly mileage, long back-to-back runs, elevation work, and careful nutrition and pacing strategies. The sport emphasizes resilience and self-management, and participants face risks such as fatigue, injury, dehydration, hypothermia, and sleep deprivation.

Notable races include the Ultra-Trail du Mont-Blanc, the Western States Endurance Run, the Hardrock 100, and the Leadville Trail 100. The sport has grown since the late 20th century, expanding globally with regional circuits and international events that attract amateur and professional athletes alike.