

The Iditarod Trail Invitational is the world's longest running winter ultra-marathon.

One of the most challenging experiences on the planet, participants brave extreme physical, environmental and mental challenges as they travel along the historic Iditarod Trail on bicycle, foot or skis. Requiring self-sufficiency and the considerable resilience to make it through up to 30 frozen days and nights, the Iditarod Trail Invitational has built its reputation on notoriously inhospitable conditions and minimal outside support.