A list of events that occurred on September 14 related to Six Flags.
- 2018 – Fright Fest 2018 begins at Six Flags Fiesta Texas.
- 2018 – Georgia Tech Night at Six Flags Over Georgia.
- 2018 – Out on the Mountain at Six Flags Magic Mountain.
- 2019
- Fright Fest 2019 begins at Six Flags Magic Mountain.
- Fright Fest 2019 begins at Six Flags Great Adventure.
- Day 1 of Lone Star Coasterthon at Six Flags Over Texas.