Frozen 4 Hour & 5K - Duluth Winter Trail Series
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Frozen 4 Hour & 5K - Duluth Winter Trail Series
The event on February 6, 2027 takes place in Duluth, MN and includes multiple race options on packed winter trails. It is organized by Adventure Running Co. and hosted as part of the Duluth Winter Trailrunning Series.
Distances and formats
- 5K race on packed winter trails
- 4 Hour timed race in Lester Park where competitors run as many miles as possible within four hours
The Frozen 4 Hour is a timed four hour event held on frozen, snowpacked, multi use trails with the course located in Lester Park and the start and finish at Lester‑Amity Chalet. The Duluth Winter Trailrunning Series uses packed fat bike trails around the city to provide scenic routes and varied winter topography. Selected venues for the series include Chester Park, Lester Park, and Hartley Park where a 10K route is scheduled.
Two races in the series offer snowshoe and "no shoe" trail running divisions. Participants who complete all four races in the series are eligible for a special award. Registration is handled through UltraSignup; available pricing ranged from USD 33.50 to USD 66.25 and registration availability opened November 4, 2026. Registration closes February 5 at 11:59 PM CT. Visit the organization's website for the most recent information.
