- How long does an unopened bottle of mustard last? The precise answer depends to a large extent on storage conditions - to maximize the shelf life of mustard, store in a cool, dry area.
How long does an unopened bottle of mustard last at room temperature? Properly stored, an unopened bottle of mustard will generally stay at best quality for about 2 years.
Is unopened mustard safe to use after the "expiration date" on the bottle? Yes, provided it is properly stored and the bottle is undamaged - commercially packaged mustard will typically 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 mustard will remain at peak quality.
Storage time shown is for best quality only - after that, the mustard's texture, color or flavor may change, but in most cases, it will still be safe to consume if it has been stored properly, the bottle is undamaged, and there are no signs of spoilage (see below).
How can you tell if mustard is bad or spoiled? The best way is to smell and look at the mustard: if the mustard develops an off odor, flavor or appearance, or if mold appears, it should be discarded.
Sources: For details about data sources used for food storage information, please click here