In all, Starr won ten official Triple Crown Classics including four Queen's Plates.
[4] Although Starr trained horses of both sexes, he was recognized as someone who also had a special talent to develop fillies.
During his career he trained horses with great success for prominent owners such as Conn Smythe and Larkin Maloney, both individually and for the Smythe/Maloney racing partnership.
In the 1970s and 1980s Starr continued as a dominant force in Canadian racing as the trainer for Quebec sportsman, Jean-Louis Levesque.
Yonnie Starr trained horses until his death in Florida in March 1990 at age eighty-four.