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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.
Six months is probably the longest it will last considering these factors. The guidelines state no more than three months in a good quality freezer Frozen items will stay edible for a long time. For hamburgers, at least a year or so. They won't taste too fresh, but they will be edible. According to the chart inside our freezer it should be OK for up to 3 months.