A list of events that occurred on May 25 related to Six Flags.

• 2012 – Goliath opens at Six Flags New England.
• 2013
  • Iron Rattler opens at Six Flags Fiesta Texas.
  • Texas SkyScreamer opens at Six Flags Over Texas.
• 2018 – Twisted Cyclone opens at Six Flags Over Georgia.
• 2019
  • Batman: The Ride opens at Six Flags Discovery Kingdom.
  • Supergirl Sky Flyer opens at Six Flags St. Louis.