Susitna 100 — Alaska’s Ultimate Winter Endurance Adventure ️
Set against the stark, stunning wilderness of Southcentral Alaska, the Susitna 100 is a legendary 100-mile winter race that draws fierce endurance athletes from around the world. Held each February near Big Lake, north of Anchorage, this human-powered race challenges racers to ski, run, or bike across a remote frozen landscape along packed snowmachine and dog-sled trails through rivers, swamps, and wooded terrain.
Participants navigate a fully marked 100-mile course that starts and finishes at Happy Trails Kennels, facing wildly variable Alaskan winter conditions — from deep snow and icy winds to sleety thaws that can turn the trail to slush. It’s a true test of grit, skill, and self-sufficiency in one of the most beautiful and unforgiving environments on Earth.
Multi-discipline Challenge: Ski, run, or bike — all on the same 100-mile winter course. Remote, Wild Terrain: Frozen rivers, muskegs, and endless snowmachine trails in the Susitna River valley. Self-Reliant Racing: Competitors carry essential survival gear and endure limited support between checkpoints. Epic Alaska Scenery: Vast snowy expanses, quiet woods, and maybe even a glimpse of wildlife or the northern lights. 48-Hour Cutoff: Racers must complete the full 100-mile distance within 48 hours.
Whether you’re chasing a personal best, seeking your first 100-mile finish, or simply looking for the kind of winter adventure few others will ever attempt, the Susitna 100 stands as one of Alaska’s most formidable and unforgettable endurance races.