When Will Six Flags Great America Open 2025 Dates. Six flags great america is gearing up for the 2025 season with new attractions and returning favorites. (wtvo) โ the rides at six flags great america are set to fire up for the 2025 season in just a few weeks.

Starting may 26, six flags will be open seven days a week through the summer. The park's daily hours and event. Six flags great america/hurricane harbor has announced the amusement park will open its doors to the public at 10:30 a.m.