Susitna 100

FEB
14-16
2026
Challenge yourself on winter trails near Big Lake, Alaska, with the remote Susitna 100 or the scenic Little Su 50K in February. Gear checks, live tracking, and a festive post race party keep the focus on safety and celebration.
14-16 Feb 2026
Susitna 100

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Event overview

The Susitna 100 and Little Su 50K are winter, human-powered trail races organized by Alaska Winter Wilderness Races. Both events take place on marked trails near Big Lake, Alaska, on terrain described as remote and frozen. The races are held in February; the listed race dates are February 14-16 for the Susitna 100 and February 15 for the Little Su 50K. Course maps, race rules, and gear information are provided by the organizer.

Race details

  • 100 miles Susitna 100
  • 50 km Little Su 50K

Both events include a gear check and a pre-race meeting. The organizer provides course descriptions and maps, and posts race results and standings. Live tracking pages for the Susitna 100 and Little Su 50 are available through UltraSignUp. The organizer also maintains additional resources such as travel and merchant information, a photo gallery, an FAQ, and a post-race party. Visit the organization's website for the most recent information.

100 mi
Susitna 100

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