The Monmouth Oaks is an American Thoroughbred horse race held annually at Monmouth Park Racetrack in Oceanport, New Jersey for three-year-old fillies. Named for England's Epsom Oaks, first run in 1779, the inaugural American edition took place in 1871. Originally raced over a distance of  1 1⁄2 miles from 1871 through 1877, there was no race in 1878 but on its return the following year was modified to  1 1⁄4 miles.