GILLETTE, Wyo. (AP) — A traditional Native American horse race in Gillette has been postponed following cold and wet conditions in northeast Wyoming.

The Gillette News Record reports the Horse Nations Indian Relay was planned for Saturday and Sunday, but rough track conditions have forced organizers to reschedule the event for Aug. 31 and Sept. 1.

The sport involves racers riding without saddles to make three laps around a track. Riders finish each lap on a different horse, so they jump on to a new horse twice during each race.

Four to six relay teams compete in every race.

The event leads up to the Championship of Champions race in Walla Walla, Washington in late September.