The Cougars won the 2017 Royal Bank Cup national junior A championship.

The team graduated to Junior "A" when the league became the OPJHL the next season.

In the summer of 2010, the Cobourg Cougars absorbed the Bowmanville Eagles.

[1] The Cougars were chosen to host the 2017 Royal Bank Cup[citation needed].

In May of 2023, one of their players, Trevor Hoskin was named MVP by the Canadian Junior Hockey League[2]