Complete MLB Season Records and Stats
A Major League season normally lasts from the beginning of April to the end of September, followed by the post-season tournament in October. The endpoints of the season gradually changed through the years. In the early days, the regular season began in late April and ran through late October. By the early 1900s the season was running from late April to late September or early October, with the World Series capping the season in October, sometimes actually starting in the last days of September.
The gradual elimination of scheduled doubleheaders in the last decade or two of the 20th Century necessitated pushing the start of the season earlier and earlier, until it sometimes starts in the last day or two of March and ends several days into October. Another recent trend has been to hold one or more games in a nation outside of the USA a day or two prior to the official Opening Day. The regular season was stopped for several days after the September 11, 2001, terrorist attacks, which extended the season until the final weeks of October.