The AMA Motocross Championship is an American motorcycle racing series. The motocross race series was founded and sanctioned by the American Motorcyclist Association (AMA) in 1972. The series is the major outdoor motocross series in the United States and is managed by MX Sports Pro Racing. The series began in 1972 with the introduction of two classes based on 500 cc and 250 cc engine formulas. A 125 cc class was added in 1974. As motocross technology developed, 500 cc two-stroke motocross bikes became too powerful for the average rider and, faced with diminishing numbers of competitors, the A.M.A. discontinued the 500 cc class after the 1993 season. A women's national championship series was introduced in 1996. Facing tightening emissions regulations, in 1997, the A.M.A. increased the allowable displacement capacity for four-stroke engines, in an effort to encourage manufacturers to develop environmentally friendlier four-stroke machines. In 2006, the 250 cc division was renamed the MX Class, with an engine formula allowing for 150–250 cc two-stroke or 250–450 cc four-stroke machines. The 125 cc class was renamed the MX Lites Class, allowing 0–125 cc two-stroke or 150–250 cc four-stroke engines. In 2009, the MX class was renamed the 450 Class and the MX Lites class was renamed the 250 Class, to reflect the fact that all the competing manufacturers had adopted four-stroke machinery.

(Motorsport) Pro Motocross SCHEDULE
2020-08-30Ironman National Watch Live
2020-08-23Budds Creek National Watch Live
2020-08-16Unadilla National Watch Live
2019-08-24Ironman National Watch Live
2019-08-17Budds Creek National Watch Live
2019-08-10Unadilla National Watch Live
2019-07-27Washougal National Watch Live
2019-07-20Spring Creek National Watch Live
2019-07-06Red Bud National Watch Live
2019-06-29Southwick National Watch Live
2019-06-22WW Ranch Motocross Park Watch Live
2019-06-15High Point National Watch Live
2019-06-01Thunder Valley National Watch Live
2019-05-25Fox Raceway at Pala Watch Live
2019-05-18Hangtown Motocross Classic Watch Live
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