It doesn't open til after it's dark. They fog it up, and put lots of strobe lighting in it. Then there are tons and tons of scary people and clowns wandering around to spook you. They have 5 different "haunted houses" you can go through, plus all the rides are open as well.
Sadly, its not super easy getting good pictures in this atmosphere so I didn't really take many.
The first chance I got was when we went into the 4D show
right after the wet wet water ride- perfect!
The whole Frightdome is not recommended for anyone under 12, but the 4D movie seriously probably wouldn't scare a 4 year old. Lame. That definitely has to go.
We did get on a few rides early in the night, then went through 4 of the haunted houses before hitting the coaster one last time. On the way out, we passed a Frightdome hearse perfect for a photo opp.