In 1919, the Chicago Bears were founded by the AE Staley Company in Decatur, IL. The team was originally known as the Staleys and played their first two seasons in Decatur at Staley Field. After the 1920 season, the Staley's moved to Chicago and Cubs Park. The team played their first game at the ballpark on October 16, 1921 when they played the Rochester Jeffersons. The following season the team was renamed the Chicago Bears. In 1922 and 1923 the ballpark was expanded as the grandstand was moved and bleachers were added increasing the capacity to 20,000. Cubs Park was renamed Wrigley Field in 1926 when the grandstand was double decked and the playing field was lowered. This expansion increased the capacity to over 38,000. Bleachers and the hand operated scoreboard were added in 1937.

For almost five decades the Bears called Wrigley Field their home. In order for football to be played at Wrigley Field, the gridiron was laid out over the infield and into left field. Bleachers were placed in right field. By 1970, Wrigley Field became to small for the Chicago Bears as the NFL and the team became very popular. The Bears played their last game at Wrigley Field on December 13, 1970 with a win over the Green Bay Packers. The following year the team moved into Soldier Field on the south side of Chicago. The Cubs continue to play at Wrigley Field as it has changed very little since the Bears left. Lights were installed in 1988 and suites were added between the lower and upper decks in 1989. Today, Wrigley Field remains one of the most popular ballparks in baseball.