Choose storage by when you will eat it
For the next two to four days, cool banana bread completely and wrap it closely at room temperature. For longer storage, freeze the whole loaf or individual slices with as little trapped air as possible.
Cool first, then wrap
Wrapping a warm loaf traps condensation, softens the crust, and can encourage spoilage. Let the bread cool on a rack, then choose the room-temperature or freezer guide below.
Know when to discard it
Throw the loaf away if you see mold or notice an alcoholic, fermented, or otherwise off odor. Reheating does not make spoiled bread safe.