Six Flags 2026 Opening Days

[Losantiville Mining Co.]

Several Six Flags parks have released portions of their 2026 operating calendars.

• Knott's Berry Farm (January 1 - March 15)
• Schlitterbahn Galveston (May 2 - September 7)
• Discovery Kingdom (January 1 - March 8)
• Great Adventure (March 28 - September 7)
• Magic Mountain (January 1 - March 12)
• Six Flags New England (April 11 - May 24)
  • This one is likely not finalized yet.
• Six Flags Over Texas (May 16 - September 7)
• Six Flags St. Louis (April 25 - September 7)
• Worlds of Fun (April 25 - September 7)

All of the calendars released so far look normal — aside from SFNE — and none appear to include random days off in the middle of the summer season. I suspect the parks with no operating dates past March will release their calendars with parks like Kings Island. The most surprising calendar for me to see is Six Flags Over Texas with its mid-May opening. That might be normal for them, but I would've assumed they'd at least open earlier in the month.