Refrigerator: Pineapple may be kept at room temperature for 1 or 2 days, but it's preferable to keep it in the fridge (up to 4 or 5 days). It's stored in the fruit and vegetable drawer in a perforated plastic bag. It will keep in an airtight container for a few days after being peeled and sliced into pieces. Peel it, remove the core, and chop it into pieces or mash it up and store it in freezer bags. It is not suggested to freeze it for more than 3 months since the flavor may be lost.