- How long do blueberry preserves last once opened? The precise answer depends to a large extent on storage conditions - to maximize the shelf life of opened blueberry preserves, keep refrigerated and tightly covered.
How long do opened blueberry preserves last in the refrigerator? Blueberry preserves that have been continuously refrigerated will generally stay at best quality for about 1 year.
Are opened blueberry preserves safe to use after the "expiration date" on the jar? Yes, provided they have been stored properly, the jar is undamaged, and there are no signs of spoilage (see below) - commercially jarred blueberry preserves 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 blueberry preserves will remain at peak quality.
The storage time shown for opened blueberry preserves are for best quality only - after that, the preserves' texture, color or flavor may change, but in most cases, they will still be safe to consume if it has been kept continuously refrigerated, the jar is undamaged, and there are no signs of spoilage (see below).
How can you tell if opened blueberry preserves are bad or spoiled? The best way is to smell and look at the blueberry preserves: if the preserves develop an off odor, flavor or appearance, or if mold appears, they should be discarded.
Sources: For details about data sources used for food storage information, please click here