I stopped by on a light-rain day and it was open. Call ahead if you have weather concerns.
Floor of cave can become really slick. Hold the hand rails when available
While it is raining isn't a big concern. It is actually after the rain once the rain has gone through the several layers of Earth that it can get muddy down there.
Yes, is open during rain!
Depends how bad and heavy it is
Not sure .. guess they may close it
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