A list of events that occurred on September 30 related to Six Flags.

• 2012 – A 19-year-old man falls from the Venom Drop water slide in Hurricane Harbor at Six Flags Magic Mountain. According to a spokesperson for the water park, the man cut in line at the slide, fought through the lifeguards and jumped onto the slide head first. The man tumbled onto the slide and slipped over the edge, falling 60 feet onto a fence below the slide tower. The local sheriff's office reported that the man was transported to an area hospital with life-threatening injuries.
• 2016 – Fright Fest 2016 begins at Six Flags St. Louis.
• 2018 – Bark in the Park at Great Escape.