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The Del Mar Oaks is an American Thoroughbred horse race run annually in mid August at the Del Mar Racetrack in Del Mar, California. Open to three-year-old fillies, it is contested at a distance of one and one-eighth miles (9 furlongs) on the turf. Since 1994 it has been a Grade I event. From its inception in 1957 through 1964, the Del Mar Oaks was raced at a distance of one mile on dirt. It was raced in two divisions in 1966 and again in 1970.