The 2018 AMA Motocross Championship season is the 46th AMA Motocross National Championship season, the premier motocross series in USA. Eli Tomac goes into the season as the defending champion in the 450 class, after taking his first 450 national title in 2017. This was Tomac's second AMA motocross title, after taking the 250 class in 2013. In the 250 class Zach Osborne is the defending champion after taking his maiden title last season.
Calendar and Results 450cc RoundDateLocationRace 1 WinnerRace 2 WinnerRound Winner 1 May 19 Hangtown Motocross Classic Eli Tomac Eli Tomac Eli Tomac 2 May 26 Glen Helen National Eli Tomac Eli Tomac Eli Tomac 3 June 2 Thunder Valley National Eli Tomac Eli Tomac Eli Tomac 4 June 16 High Point National Marvin Musquin Eli Tomac Eli Tomac 5 June 23 Tennessee National Eli Tomac Marvin Musquin Eli Tomac 6 July 30 Southwick National Eli Tomac Marvin Musquin Marvin Musquin 7 July 7 Red Bud National Ken Roczen Marvin Musquin Marvin Musquin 8 July 21 Spring Creek National Eli Tomac Eli Tomac Eli Tomac 9 July 28 Washougal National Eli Tomac Eli Tomac Eli Tomac 10 August 11 Unadilla National Eli Tomac Marvin Musquin Marvin Musquin 11 August 18 Budds Creek National Ken Roczen Eli Tomac Eli Tomac 12 August 25 Ironman National Justin Barcia Justin Barcia Justin Barcia
250cc RoundDateLocationRace 1 WinnerRace 2 WinnerRound Winner 1 May 19 Hangtown Motocross Classic Zach Osborne Zach Osborne Zach Osborne 2 May 26 Glen Helen National Aaron Plessinger Aaron Plessinger Aaron Plessinger 3 June 2 Thunder Valley National Justin Cooper Jeremy Martin Jeremy Martin 4 June 16 High Point National Aaron Plessinger Aaron Plessinger Aaron Plessinger 5 June 23 Tennessee National Jeremy Martin Dylan Ferrandis Shane McElrath 6 July 30 Southwick National Austin Forkner Dylan Ferrandis Dylan Ferrandis 7 July 7 Red Bud National Aaron Plessinger Aaron Plessinger Aaron Plessinger 8 July 21 Spring Creek National Aaron Plessinger Aaron Plessinger Aaron Plessinger 9 July 28 Washougal National Joey Savatgy Shane McElrath Aaron Plessinger 10 August 11 Unadilla National Dylan Ferrandis Dylan Ferrandis Dylan Ferrandis 11 August 18 Budds Creek National Aaron Plessinger RJ Hampshire RJ Hampshire 12 August 25 Ironman National Aaron Plessinger Aaron Plessinger Aaron Plessinger
450cc
Entry list