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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.
Q: How long can I keep my homemade jams and jellies once I open them? A: Opened home-canned jams and jellies should be kept in the refrigerator at 40F or lower. Regular  or pectin-added, full-sugar  cooked jams and jellies are best stored for 1 month in the refrigerator after opening. They may last longer depending on the specific product and how it is used.