First of all, when freezing bananas, make sure they haven’t gone bad. Bananas are known for their yellow skin. Over time, as they ripen, they can develop brown spots. That’s usually not something to worry about. Even a banana that looks completely brown on the outside could still be edible inside. In fact, overripe bananas are perfect for baking and cooking.
However, if you see mould developing on the skin, it’s usually a sign that a banana has gone bad. The best way to check whether you can still freeze a banana is by peeling it. If the fruit inside has gone brown and is mushy, you shouldn’t be using it.