There are two proffesional ISR sanctioned grass racing organizations in the State of Michigan.
PSGDRA Pro Snowmobile Grass Drag Racing Association. Check their website for race info and schedule.
MSDRA Michigan Snowmobile Drag Race Association. Check their website for race info and schedule.
Ametuer Races
Entry level local Snowmobile Club races. (More to come)
Twisting Trails Snow Braves Located north of Muskegon offers a four lane 500' track, with single light starting and laser finish line. Trophy races, schedule posted and more info on their website.
White Cloud Snow Chasers Located just west of White Cloud. Four lane 500' track, starting lights, judged finish line. Trophy races, usually three or four races are held each fall. (more info to come)
Big Bouys Toys Located near Dowagiac. Usually holds two races. (more info to come)
BoonTown Grass Drags Located in the Cadilac area, put on by the Crossroads Trailblazers Snowmobile Club.