They played in the Central Junior B Hockey League.

[1] The Thornhill Thunderbirds were a junior hockey team in Ontario.

A second Thornhill Thunderbirds team is now known as the Mississauga Chargers.

Hockey returned to Thornhill in 1988, when the Metro Junior B Richmond Hill Dukes moved to Thornhill again assuming the Thunderbirds nickname.

In 1991 they returned to their Thornhill Thunderbirds name for one season.