Oxford Plains Speedway is a racetrack in Oxford, Maine, USA. Established in 1950, it has been home to various NASCAR Nationwide Series events, including the True Value Oxford 250, Oxford 250 and True Value 250. With 14000 seats, the speedway has the largest seating capacity of any sporting venue in Maine. The main race held there is the TD Banknorth 250. The stadium held The Monsters of Rock Festival .