How long does Cornstarch last after opening?

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

Once opened, Cornstarch keeps about 18 months in the pantry. Unopened, it keeps about 18–24 months.

Source: USDA FoodKeeper v128 · Category: Baking & cooking

How long Cornstarch keeps

SituationKeeps for
Unopened · pantry18–24 months
Opened · pantry18 months

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 Cornstarch has gone bad

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

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FAQ

How long does Cornstarch last after opening?

About 18 months in the pantry, according to USDA FoodKeeper v128.

Does Cornstarch need to be refrigerated after opening?

Cornstarch is 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 Cornstarch is bad?

Look for: A rancid, paint-like, or musty smell; Clumping, or moisture in something that should be dry; Insects, webbing, or larvae in the package; Faded colour or a lost aroma. Never taste something to test it — when in doubt, throw it out.

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