The Astros clinched their first division title as a member of the American League West division, and first division title overall since 2001. They also became the first team in Major League history to win three different divisions, the National League West in 1980 and 1986, the National League Central from 1997–1999 and 2001, and now the American League West in 2017.
On September 29, the Astros won their 100th game of the season, the second time the Astros finished a season with over 100 wins (the other time was in 1998). They finished 101–61 (with a 21-game lead in the division), and faced the Red Sox in the second round of the AL playoffs. The Astros defeated the Red Sox three games to one, and advanced to the American League Championship Series against the New York Yankees. The Astros won the ALCS four games to three, and advanced to the World Series to play against the Los Angeles Dodgers. The Astros defeated the Dodgers in the deciding seventh game of the World Series, winning the first championship in franchise history. The city of Houston celebrated the team's accomplishment during the afternoon of November 3, 2017. There was a parade in their honor, and the festivities included a large balloon depicting a baseball, cheerleaders and the animated participation by Orbit. Houston's Independent School District gave the students and teachers the day off to watch the parade.