Vaughan captured the league double for a second time by also winning the L1 Cup, a feat they first achieved in 2016.
The women's side saw a shorter season which ended in August, followed by a four-team elimination playoff for the league title.
The top eight teams competed in the league playoffs at the end of the season, the winner of which earned entry into the 2019 Canadian Championship.
The league champion was determined by a single match between the two group winners in the first round of the playoffs.
The L1 Cup tournament is a separate contest from the rest of the season, in which all 17 teams from the men's division took part.
It is not a form of playoffs at the end of the season (as is typically seen in North American sports), but is more like the EFL Cup, albeit only for League1 Ontario teams.