There is, in fact, as US lawn mower racing association and yes, people tune their lawn mowers to race them.
Avon Park is home to the Avon Park Mower Plex. Racing season starts at the end of the summer, a date for this year's season is still to be determined. Check out the "Mower Plex" website for updates.
Having your hotdog while watching lawn mowers zoom by is quite an experience and a great way to meet with folks in your community.
Avon Park Mower Plex is located on Herrick Road, off CR 64 right behind the Avon Park Airport.