They are a part of the Provincial Junior Hockey League assigned to the South Conference and in the Bloomfield Division.

[3] The Streetsville Derbys were chosen by the Canadian Junior A Hockey League to host the 2006 Royal Bank Cup.

Instead of playing the games in a local arena, the Derbys' ownership elected to use the larger, neighbouring Powerade Centre in the rival town of Brampton, Ontario.

Streetsville finished first in the round robin (3-1), only to bow out with a 2–1 loss to the Yorkton Terriers of the Saskatchewan Junior Hockey League in the semi-final.

In March 2011, the Streetsville Derbys merged into the Cobourg Cougars and ceased to exist as members of the OJHL.