AMA Motocross Championship
Glen Helen has hosted off-road races since 1985. Its motocross track is known for its steep hills, jumps and banking. It hosted a round of the AMA Motocross Championship in 1993, later from 1996 to 2009, and currently since 2014. It is typically held in May, originally on Mother's Day and currently on Memorial Day, except from 2004 to 2007, when it held in mid September as the final round.