The Viking Challenge 5K and The Viking Crusade 10K extreme wilderness mud runs are located in the beautiful hills of Otter Tail County, MN. Located just 12 miles north of Fergus Falls, the Challenge and Crusade is an annual event created on over 400 acres of wooded areas with rolling meadows, meandering trails, lakes and lots of MUD!  The only permanent natural obstacle mud run in Minnesota.  It’s extreme, its beautiful, it will challenge your body, your mind, and your ability.  The Viking Challenge and Crusade.   One of the Fergus Falls Race Series events.