Water Park Refurbs

Do BB &TL flip the time they close each winter for Refurbs? Last winter TL closed Oct to Dec and BB closed Jan to Mar but this winter it is the other way round. We are
Planning big birthday trip in 2018 and which one is closed when affects dates we go.

Usually it flips (why do I think there was one year it didn’t?).

BB is closing in October this year