Storage: After the banana bread has completely cooled, wrap in sealed plastic bags or store in air tight containers. You must store the banana bread in the refrigerator. Bread will last for up to 7 days in the fridge or 3-4 months in the freezer. Reheating: Toaster oven is great for heating up a slice, then add a pad of butter (optional) or microwave a slice for about 3o seconds. Tastes great right out of the fridge.