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 1⅛-mile race on dirt is considered one of the most important prep races for Canada's premier horse race, the Queen's Plate.Inaugurated in 1944 at the Old Woodbine Race Course as a six furlong sprint race, it was moved to the new Woodbine Racetrack in 1957 following that track's closure.