Six Flags Great America will mark its 50th anniversary on May 29, 2026, with a day bash in Gurnee. The six flags great america celebration ties a 1976 debut to a park that has spent five decades turning into one of Illinois’ most-visited entertainment venues.
Gurnee’s May 29 lineup
The park will launch a 50th Anniversary Day Bash with a Legacy Museum grand opening and a 9:30 PM fireworks spectacle. Six Flags Great America said, “Fifty years of thrills, millions of memories, one unforgettable place—this is what Six Flags Great America means to the Midwest.”
That quote does the work here. The park is not just marking an age milestone; it is packaging its history as an event, with the museum opening inside the Emporium giving the anniversary a fixed place on the property instead of leaving it as a generic party theme.
From Marriott to Six Flags
Marriott Corporation opened the park on May 29, 1976, as Marriott’s Great America, with the launch timed to the United States Bicentennial celebration. Six Flags acquired the park in 1984, and it became the chain’s seventh location.
The ride count now sits at 16 roller coasters, with Raging Bull part of the lineup since 1988. Batman: The Ride brought suspended innovation to the park, and X-Flight introduced wing coaster technology to the region.
June 20 through August 9
The commemorative machine then runs June 20 through August 9, when the all-new Nighttime Spectacular is set to bring original stage show choreography and a park-debut parade. For visitors, the practical read is simple: May 29 is the ceremonial kickoff, but the anniversary programming is designed to stretch well beyond opening day.
