Season Description The 2023 Major League Soccer season was the 28th season of Major League Soccer (MLS), the top professional soccer league in the United States and Canada, and the 45th season overall of a national first-division league in the United States. The league expanded to 29 clubs following the addition of St. Louis City SC to the Western Conference, with Nashville SC moving back to the Eastern Conference. The regular season began on February 25 and concluded on October 21; it was followed by the playoffs which commenced on October 25. The regular schedule was released on December 20, 2022. The regular season was paused from July 20 to August 19 for the month-long Leagues Cup, during which time MLS teams played Liga MX opponents.