Alaska Winter Wilderness Races is the organizing body behind two of the most iconic and demanding cold-weather endurance events in North America: the Susitna 100 and the Little Su 50K. These human-powered races take place each February in the dramatic and unforgiving landscape around Big Lake, Alaska, inviting participants to test their limits in deep winter conditions.

Founded with a passion for adventure and a love for Alaska’s rugged backcountry, the organization offers a rare opportunity to race on snow-covered, marked trails with breathtaking views and constantly changing terrain. Participants can expect snow, ice, wind, and possibly sunshine, sometimes all in one race, as they navigate by foot, bike, or skis through pristine wilderness.

Held each year over Presidents Day Weekend, the Susitna 100 and Little Su 50K are more than races, they are immersive winter expeditions that demand grit, preparation, and a deep respect for nature. Alaska Winter Wilderness Races provides not just a course, but a full winter adventure that attracts endurance athletes from around the world. For those drawn to solitude, snow, and self-discovery, these races offer a truly unforgettable test.