Cave of the Winds tickets are usually final sale.

Probably not. The cave is underground, so heavy rain doesn’t really affect the tour. Unless the park itself closes due to extreme weather (like lightning or flooding near the entrance), they treat it as rain or shine.

Check their official policy to be sure, but most cave attractions will only reschedule if they cancel. A forecast of rain isn’t enough.

Buying ahead? I’d risk it — the cave stays dry.