The hours will be posted in the Navigator, but they all close before midnight unless the teens have a late night pool party.
The Goofy pool will be closed any time there is a deck party. Mickey pool closes earlier...like 10 ish most nights. Quiet Cove is midnight most nights.
The pools are heated, so the water is always warm. When the pools are closed at night, they are drained and cleaned, then heated thru the rest of the night.