List of American and Canadian Graded races

The list of American and Canadian Graded races is a list of Thoroughbred horse races in the United States and Canada that meet the graded stakes standards maintained by the American Graded Stakes Committee of the Thoroughbred Owners and Breeders Association and the Jockey Club of Canada. A specific grade level (I, II, III or listed) is then assigned to the race, based on statistical analysis of the quality of the field in previous years, provided the race meets the minimum purse criteria for the grade in question.

Source: Wikipedia — List of American and Canadian Graded races (CC BY-SA 4.0)