High Quality Content by WIKIPEDIA articles! The Pacific Classic Stakes is an American Thoroughbred horse race for runners aged 3-year-old or up run at the classic American distance of a mile and a quarter (10 furlongs, 2 km). It is run each year in August at Del Mar Racetrack in Del Mar, Calif., and the Grade 1 race has become one of the top prizes for older horses racing in the United States each year.