AMA Motocross Championship
Since 2011, Musquin has competed in the 250cc class of the AMA Motocross Championship, finishing the 2013 season in third place overall. In 2014 he won the first Red Bull Straight Rhythm in the 250cc class. In 2015 he won the East Coast Supercross 250MX class Championship. Musquin was also a member of the victorious French 2015 Motocross des Nations team that included Gautier Paulin and Romain Febvre.