What is the shelf life of an unopened package of marshmallows?

How long does marshmallow cream stay good if never opened?

Marshmallow creme is an American food item. It is a very sweet, spreadable, marshmallow-like confection. Marshmallow creme and peanut butter are used to create a Fluffernutter sandwich. In addition, marshmallow creme and Nutella can be spread on graham crackers to emulate smores.

One popular brand of marshmallow creme, sold principally in the Northeastern United States, is Marshmallow Fluff. It is also available in many north European supermarkets (e.g., Scandinavia, UK, Germany) in standard and strawberry flavour. Its ingredients consist only of corn syrup, sugar syrup, vanilla flavor, and egg whites. Ricemellow Creme, manufactured by Suzanne's Specialties, Inc., is a common vegan equivalent.

Up to 1 month after opening, it can be kept on shelf and it need not be kept in the refrigerator. Before opening, shelf-stable foods should be safe unless the can or packaging has been damaged. After opening, the products should be kept in tightly closed containers. The storage of many shelf-stable items at room temperature is a quality issue -- unless the product is contaminated (bugs in flour, for example). Some foods must be refrigerated after opening, such as tuna or chili.