100 mile and 50 kilometer winter races in remote frozen Alaska on skis, bike or foot.

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