Arrowhead 135 mile Winter Ultramarathon

The Arrowhead 135 mile Winter Ultramarathon starts at 7 a.m. on January 25, 2027, in International Falls, Minnesota, and covers 135 miles (217 kilometers) in the depths of a northern Minnesota winter. There is one distance and no shorter option, which tells you most of what you need to know about who this event is for.

This is not a race you enter off general fitness. Beyond the distance, which alone puts it among the longest ultras in the country, the winter conditions turn gear, layering and self-sufficiency into the primary problems to solve. Preparation means many months of high-volume weeks, long training days in cold and dark, and rehearsed systems for staying warm while moving slowly and while stopped. If you are working toward something like this, a shorter winter ultra the previous season is the usual stepping stone.