The Nanny Goat 24 hour race takes place on a one mile dirt loop on a private horse ranch located in Riverside California. The race is open to solo runners or teams of four runners. Teams may be all women, all men, or mixed. The object is to complete as many laps as possible within an allotted 12 or 24 hour period. Any runner logging 86 or more miles in 24 hours may continue to 100 miles (with a firm cutoff at 28 hours).