The May Bumps (also May Races, Mays) are a set of rowing races, held annually on the River Cam in Cambridge. They began in 1887 after separating from the Lent Bumps, the equivalent bumping races held at the end of February or start of March. Prior to the separation there had been a single set of annual bumps dating from its inception in 1827. The races are open to all college boat clubs from the University of Cambridge, the University Medical and Veterinary Schools and Anglia Ruskin Boat Club. The May Bumps takes place over four days (Wednesday to Saturday) in mid-June and is run as a bumps race.