How long do Marshmallows last after opening?

Updated 2026-08-07 · Free · No sign-up

Once opened, Marshmallows keep about 1 month in the pantry. Unopened, they keep about 1 year.

Source: USDA FoodKeeper v128 · Category: Pantry staples

How long Marshmallows keep

SituationKeeps for
Unopened · pantry1 year
Opened · pantry1 month

Only situations with a published figure are listed. A blank isn't “forever” — it means no reliable number is published for it.

Storage

How to tell if Marshmallows has gone bad

These are the general spoilage signs for pantry staples — never taste something to test it. When in doubt, throw it out.

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FAQ

How long do Marshmallows last after opening?

About 1 month in the pantry, according to USDA FoodKeeper v128.

Do Marshmallows need to be refrigerated after opening?

Marshmallows are shelf-stable at room temperature: cool, dry pantry, sealed — refrigerating after opening is optional and mainly preserves quality. Refrigerating it mainly preserves quality rather than safety.

How can you tell if Marshmallows are bad?

Look for: A rancid, paint-like, or musty smell; Bulging, leaking, deeply dented, or rusted cans; Insects or webbing in dry goods; Mould or discoloration. Never taste something to test it — when in doubt, throw it out.

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