Title: Major League Baseball schedule
Content:  The Major League Baseball (MLB) season schedule generally consists of 162 games for each of the 30 teams in the American League (AL) and National League (NL), played over approximately six months—a total of 2,430 games, plus the postseason. The regular season runs from late March/early April to late September/early October, followed by the postseason which can run to early November. The season begins with the official Opening Day, and, as of 2018, runs 26½ weeks through the last Sunday of September or first Sunday of October. One or more International Opener games may be scheduled outside the United States before the official Opening Day. It is possible for a given team to play a maximum of 20 games in the postseason in a 
Title: Season (sports)
Content:  In an organized sports league, a typical season is the portion of one year in which regulated games of the sport are in session: for example, in Major League Baseball the season lasts approximately from the last week of March to the last week of September. In other team sports, like association football or basketball, it is generally from August or September to May although in some countries - such as Northern Europe or East Asia - the season starts in the spring and finishes in autumn, mainly due to weather conditions encountered during the winter. A year can often be broken up into several distinct sections (sometimes themselves called seasons). These are: a preseason, a series of exhibition games played for training purposes; a regular season, the main period of the league's competition; the postseason, a playoff tournament played against the league's top teams to determine the league's champion; and the offseason, the time when there is no official competition.
Title: 2019 Major League Baseball season
Content:  The 2019 Major League Baseball season began on March 20, while the regular season ended on September 29. It was the 150th anniversary of professional baseball, dating back to the 1869 foundation of the Cincinnati Red Stockings. The postseason began on October 1. The World Series began October 22 and ended October 30 with the Washington Nationals defeating the Houston Astros in seven games to win their first World Series championship. The entire schedule was released on August 22, 2018. The 90th Major League Baseball All-Star Game was held on July 9 at Progressive Field, home of the Cleveland Indians. The American League won, 4–3, for its seventh straight victory. This was the final season when anyone on the 40-man expanded roster could be used in games from September 1 through the end of the regular season (so-called September call-ups).
Title: Spring training
Content:   In Major League Baseball (MLB), spring training is a series of practices and exhibition games preceding the start of the regular season. Spring training allows new players to try out for roster and position spots, and gives established players practice time prior to competitive play. Spring training has always attracted fan attention, drawing crowds who travel to the warm climates of Arizona and Florida to enjoy the weather and watch their favorite teams play, and spring training usually coincides with spring break for many US students. Regardless of regular-season league affiliation, teams generally play their exhibition games against other clubs training in the same state. Teams that train in Arizona form the Cactus League and Florida-training clubs form the Grapefruit League. Spring training typically starts in mid-February and continues until just before Opening Day of the regular season, which falls in the last week of March. In some years, teams not scheduled to play on Opening Day will play spring training games that day. Pitchers and catchers report to spring training first because pitchers benefit from a longer training period. A few days later, position players arrive and team practice begins. Exhibition games usually begin in late February.
Title: 2020 Major League Baseball season
Content:  The 2020 Major League Baseball season began on July 23 and ended on September 27 with 60 games amidst the COVID-19 pandemic. The full 162-game regular season was originally scheduled to begin on March 26. However, the pandemic caused Major League Baseball (MLB) to announce on March 12 that the remainder of spring training was canceled and that the start of the regular season would be delayed by at least two weeks. On March 16, MLB announced that the season would be postponed indefinitely, following recommendations from the Centers for Disease Control and Prevention to restrict events of more than 50 people. This was the first 
Title: 2022 Major League Baseball season
Content:  The 2022 Major League Baseball season is scheduled to begin on March 31 and end on October 2. The 92nd All-Star Game is planned for July 19, hosted by the Los Angeles Dodgers at Dodger Stadium in Los Angeles. The Cleveland Indians were renamed to the Cleveland Guardians prior to the start of the season. On December 2, 2021, Commissioner of Baseball Rob Manfred announced a lockout of players, following expiration of the collective bargaining agreement (CBA) between the league and the Major League Baseball Players Association (MLBPA). As a result, the season's schedule is contingent on the outcome of the lockout.
Title: MLB Draft League
Content:  The MLB Draft League is a collegiate summer baseball league that began play in 2021. Created by Major League Baseball (MLB) and Prep Baseball Report, the league serves as a showcase for top draft-eligible prospects leading up to each summer's MLB draft. The league's initial six teams were formerly members of Minor League Baseball's New York–Penn League, Eastern League, and Carolina League before MLB's reorganization of the minors for 2021. Each team in the league plays a 68-game regular season, with an All-Star Break taking place around the MLB draft.
Title: 2018 Major League Baseball season
Content:  two-game series (one home, one away) against each team for two other opponents (total of eight games), and a single three-game series against each team for the last two (one home, one away; total of six games). Under the new collective bargaining agreement reached in December 2016, the regular season was extended to 187 days in order to add four additional off-days for all teams. All teams were scheduled to play Opening Day, March 29—the earliest domestic start of a regular season in league history until the 2019 season. The Sunday night game before the All-Star Game was replaced by a single, nationally televised game on the Thursday after the All-Star Game 
Title: Opening Day
Content:  Major League Baseball had most of its teams open the 2011 season on a Thursday (March 31) or Friday (April 1) rather than the traditional Monday, in order to prevent the World Series from extending into November. Similarly, most teams opened the 2012 season on Thursday (April 5) or Friday (April 6). However, subsequent seasons through 2017 returned to Monday openers for most teams. For the 2018 season, all 30 teams were scheduled to open the season on Thursday, March 29 (the earliest domestic start for a regular season in MLB history, and the first time since 1968 that all major league teams were scheduled to start the season on the same day, although two games were subsequently rained out and postponed to Friday, March 30). In 2019, MLB scheduled an even earlier opening day for most teams on Thursday, March 28; this excludes a two-game series on March 20 and 21 between the Seattle Mariners and Oakland A's at the Tokyo Dome in Japan. The opening of the 2020 season was originally scheduled for Thursday, March 26, but was rescheduled to Thursday, July 23 and Friday, July 24 due to the COVID-19 pandemic.
Title: 2022 Major League Baseball season
Content:  Major League Baseball released their 2022 regular season schedule on August 4, 2021. As has been the case since 2013, all teams play their four division opponents 19 times each for a total of 76 games, play six or seven games against each of the other ten same-league opponents for a total of 66 games, and 20 interleague games. Interleague play will feature AL East vs. NL Central, AL Central vs. NL West, and AL West vs. NL East. The MLB at Field of Dreams game is planned to return for a second year, featuring the Chicago Cubs and the Cincinnati Reds at the purpose built ballpark in Dyersville, Iowa on August 11. The annual MLB Little League Classic is scheduled to feature the Boston Red Sox and the Baltimore Orioles at Bowman Field in Williamsport, Pennsylvania on August 21.

Question: when does the mlb season start and finish?
Answer: March 29.
October 31, 2018.