A list of events that occurred on April 1 related to Six Flags.
- 1976 – Troy Baker is born.
- 1998 – Time Warner sells Six Flags to Premier Parks for $1.86 billion.
- 2005 – Six Flags New England opens for the 2005 season.
- 2006 – Goliath opens at Six Flags Over Georgia.
- 2017 - Patriot at California’s Great America opens.
- 2021
- Six Flags Magic Mountain opens for the 2021 season.
- Six Flags Discovery Kingdom opens for the 2021 season.