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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.
4. Time, Temperature, and Concentration: These three things affect how quickly and strongly the gelatin works. The longer your finished recipe sits, the more rubbery and solidified it gets. This is why Jello always tasted better on the first day than the fifth day. Cool temperatures also make the gelatin stronger.