Jockey Justin Stein led his horse to the lead from the start, then held on to win the opening leg of the Triple Crown in an unofficial track-record time of 2:01.99 in a light rain over the 1 1/4-mile race on the Woodbine polytrack.
Fillies Irish Mission and Dixie Strike were second and third, respectively, in the 14-horse field of North America's oldest continuously run stakes race.
The Queen's Plate win was the first for B.C. native Stein and second for trainer Dan Vello, who won in '94 with Basqueian.
The second Canadian Triple crown event is the $500,000 Prince of Wales Stakes, which will be held July 15 at Fort Erie Racetrack.