The 2017 Major League Soccer season was the 22nd season of Major League Soccer, top division of soccer in the United States and Canada. The regular season began on March 3, 2017 and concluded on October 22, 2017. The MLS Cup Playoffs began on October 25, 2017 and concluded with MLS Cup 2017 on December 9, 2017. Two new clubs joined the league as expansion franchises: Atlanta United FC and Minnesota United FC. The two franchises were the 21st and 22nd teams in the league.