If You Leave Jam Out of the Refrigerator, It will Last Longer.
It is not necessary to refrigerate jam, despite the fact that it is made with fruit, because jam is suitable for long-term storage due to its low water content and abundance of preservatives. Jam has a pH of three, which is too acidic for bacteria to live in.
The high moisture content of jam causes it to lose some of its potency when it is refrigerated, where it will only remain edible for a period of six months. Jam can be stored for up to two years in the pantry, but it will only remain edible for a period of six months in the refrigerator.