Iditarod Trail Invitational

The Iditarod Trail Invitational is one of the world’s toughest winter ultra-endurance events, taking participants deep into the remote wilderness of Alaska. Following sections of the historic Iditarod Trail, the event challenges athletes to travel through frozen rivers, snow-covered forests and isolated mountain landscapes using a bicycle, skis or on foot.

Routes and terrain

The event offers three main distances: 150, 350 and 1,000 miles. The 150-mile distance introduces participants to the demands of Alaskan winter travel, while the 350-mile route takes riders deeper into the wilderness towards McGrath. The ultimate 1,000-mile challenge continues all the way to Nome, following the historic trail towards the Bering Sea.

Conditions can be extremely demanding, with deep snow, freezing temperatures, strong winds and constantly changing trail surfaces. Fat bikes are commonly used by cyclists, while careful equipment selection and winter navigation skills are essential.

Self-supported winter challenge

The Iditarod Trail Invitational follows a self-supported format. Participants must manage their own navigation, food, equipment and sleep while travelling through some of Alaska’s most isolated regions. The route is largely unmarked, requiring athletes to find their way between checkpoints and make independent decisions in challenging winter conditions.

More than a test of physical endurance, the ITI demands experience in winter camping, cold-weather survival and remote wilderness travel. It is an extraordinary challenge reserved for experienced adventurers prepared to face the unpredictable conditions of the Alaskan interior.