The Plate Trial Stakes is a Canadian Thoroughbred flat horserace for three-Year-Olds, foaled in Canada run annually at Woodbine Racetrack in Toronto, Ontario. Raced in early June, the  1 1⁄8-mile race on dirt is considered one of the most important prep races for Canada's premier horse race, the Queen's Plate. Hall of Fame jockey Avelino Gomez won this race a record nine times including four in a row from 1964 through 1967. In 1955, Ace Marine won two versions of the race, one at six furlongs and another at a mile and 70 yards.