More than 15,000 people are expected to descend on the small town for the first Tough Mudder event in WA, as they head to WPC Farm in Copley.
The farm has more than 400ha of land with open rolling hills, wooded stretches, two natural springs, eight large dams and a motocross track.
The course, which consists of events today and tomorrow, includes three-metre walls, mud pits and ice baths.
Participants tackle the course in groups, as some obstacles are almost impossible to complete individually.
During the two days, there could be more than 6000 cars driving to the area.
WPC Farm is at 724 Leaver Road, Copley. Spectator tickets cost $40.