A list of events that occurred on January 1 (New Year's Day) related to Six Flags.

• 2003 – Winter Lights closes for the 2002/2003 season at Six Flags Great Adventure.
• 2012 – Pandemonium closes at Six Flags Discovery Kingdom.
• 2017
  • Holiday in the Park 2016 ends at Six Flags Discovery Kingdom.
  • Holiday in the Park 2016 ends at Six Flags Fiesta Texas.
  • Holiday in the Park 2016 ends at Six Flags Over Georgia.
  • Holiday in the Park 2016 ends at Six Flags Magic Mountain.

• 2018 – Final night of Holiday in the Park 2017 and the 2017 season at Six Flags St. Louis.
• 2019
  • Pirates of the Deep Sea soft opens for season passholders at Six Flags Fiesta Texas.
  • Final night of Holiday in the Park 2018 and the 2018 season at Six Flags America.
  • Final night of Holiday in the Park 2018 and the 2018 season at Six Flags Great Adventure.
  • Final night of Holiday in the Park 2018 and the 2018 season at Six Flags New England.
  • Final night of Holiday in the Park 2018 and the 2018 season at Six Flags St. Louis.
• 2020 – Holiday in the Park 2019 ends at Six Flags America.