Lost Soul Ultra Marathon 2025

The Lost Soul Ultra offers 50K, 100K, and 100-Mile distances, challenging runners to conquer the stunning yet unforgiving coulees of Lethbridge, Alberta. Known as the “Toughest Race on the Prairies,” this iconic event takes place the weekend after Labour Day.

The trail winds through the river valley coulees, traversing both public and private land, where participants face fierce competition, unpredictable elements, and relentless hills.

As a testament to its rigor and prestige, the Lost Soul Ultra continues to be a 100K qualifier for the Western States 100-Mile Endurance Run.