Hello, I'm a food preservation expert with extensive knowledge on the storage of various food products, including condiments like jam.

Once jam is opened, it's generally recommended to refrigerate it to extend its shelf life. Unopened jars of jam can be stored at room temperature, but once the seal is broken, the sugar in the jam can absorb moisture from the air, which can lead to spoilage. Refrigeration slows down the growth of bacteria and mold, helping to maintain the jam's quality and safety.

However, it's important to note that refrigeration doesn't guarantee that the jam will last indefinitely. Always check for signs of spoilage, such as mold, off smell, or change in texture, before consuming.

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Refrigeration is not necessary, although it does slow down the oil-separation process. Do I need to refrigerate your jams, jellies, preserves and fruit spreads? We recommend refrigerating our fruit spreads, jams, jellies and preserves after opening, per the instructions on the back label of our products.read more >>