The Canadian Lacrosse League (CLax) is a men's professional indoor lacrosse league based in Canada, beginning play in January 2012. The league is North America's third professional lacrosse league, after Major League Lacrosse (a field lacrosse league) and the National Lacrosse League (the established professional indoor lacrosse organization). Similar to the NLL and unlike other lacrosse leagues that play in the summer, the Clax plays its games in the winter and spring.
The league's original intentions were to feature eastern and western leagues. This plan was modified to have multiple Ontario teams and one Quebec location in the first year.
The first three teams announced were franchises in Ohsweken, Peterborough, and Montreal. An article in July listed a team in London. Of the original three, only Oshweken wound up with an actual team in the 2012 season. With only three teams, the league decided two teams should operate in each announced location, leading to the creation of the Iroquois Ironmen, Peel Avengers, and Durham TurfDogs. Rodney Hill operated the two Oshweken teams, but the league owned the other clubs initially.
It was announced on October 3, 2012 that the league would be expanding to three new markets: Barrie, Toronto, and St. Catharines. The Oshawa Machine would be moving to Toronto to become the Toronto Shooting Stars, the Peel Avengers would relocate to St. Catharines, and the city of Barrie would be awarded an expansion team. It was also announced that the Durham Turf Dogs would be changing their name to the Oshawa Turf Dogs.