Is splash lagoon open in the fall or winter? I Was looking for October but it didn't give me an option for October . TIA

Splash Lagoon is open all year round

Year round. I'm not sure about the indoor one in Ohio though. Don't forget to take a waterproof phone case! They're $25 there. $5-10 everywhere else.

It should be open.

Yes it is went 2 winters ago

I believe so. I took my son in November. Unless they've changed since we last went in 2017.