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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.
The first sign of caution is when you see pockets of watery liquid (the liquid has separated from the other ingredients) and the sweet taste is replaced with a sharp, bitter flavor. You can tell if prepared jello has gone bad if you see bright bacterial marks or dark mold on its surface. Always toss any food with mold.