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How Long Does Jello Last? Jello - How long does Jello Last? An unopened box of Jello gelatin can last indefinitely, whereas prepared Jello will only last about a week. The shelf life of jello can vary due to the type, packaging, storage method, and thickening agent used. Jello is typically created by adding boiling water to a powdered mix or purchased in ready made serving containers.
According to EatByDate, prepared JELL-O stays fresh for seven to 10 days when refrigerated. Sealed containers of pre-packaged JELL-O remain fresh for three to four months in the pantry or 12 to 18 months in the refrigerator. Unopened dry JELL-O mix lasts indefinitely.