- The answer to the question "How long does salt last?" is a matter of quality, not safety, assuming proper storage conditions — when properly stored, a package of salt has an indefinite shelf life, even after it has been opened.
To maximize the shelf life of salt for quality purposes, store in a cool dry area away from direct heat or sunlight; keep tightly closed when not in use.
Is salt safe to use after the "expiration" date on the package? Yes, provided it is properly stored and the package is undamaged — commercially packaged salt may carry a "Best By," "Best if Used By," "Best Before," or "Best When Used By" date but this is not a safety date, it is the manufacturer's estimate of how long the salt will remain at peak quality.
How to tell if salt has gone bad? The shelf life of salt is indefinite, but if salt develops an off flavor or appearance, it should be discarded for quality purposes.
Sources: For details about data sources used for food storage information, please click here