[1][2] The league Championnat National Haïtien Professionnel is split into two tournaments—the Série d'Ouverture and the Série de Clôture—each with identical formats and each contested by the same 16 teams.
At the end of the 2017 season, the bottom three teams in the aggregate table; Éclair AC, America FC, and Juventus; were relegated to the Haitian second-level leagues.
The 2018 Série d'Ouverture began on 17 February 2018 and the regular season ended on 6 May 2018.
The 2018 Série de Clôture began on 1 September 2018 and the regular season ended on 11 December 2018.
Due to this, a playoff match was played on 27 December 2018 to determine a season champion.