A list of events that occurred on May 28 related to Six Flags.

• 1999 – Poltergeist opens at Six Flags Fiesta Texas.
• 2004 – Ragin' Cajun opens at Six Flags Great America.
• 2005 – Hurricane Harbor opens at Six Flags Great America.
• 2011 – Road Runner Express opens at Six Flags Magic Mountain.
• 2016
  • The Joker opens at Six Flags Great Adventure.
  • Greezed Lightnin' opens at The Great Escape.
• 2019 – El Diablo opens at Six Flags Over Texas.
• 2022 - DC Universe opens at Six Flags Great America.