Why do you keep jam in the fridge?
Jam. Jam is naturally acidic thanks to its fruit content, which helps to prevent the growth of bacteria, and if you eat it within three or four months you can keep it in the cupboard as long it doesn't become contaminated.
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How should you store jam?
Home-made jam should be stored in a cool, dry place away from direct light and used within 12 months of making. Once opened the jar should be stored in the refrigerator and used within one month. We would suggest discarding any jars of jam that have mould growing on top.
Is jam better in the fridge?
Surprisingly, jam and marmalade is best stored in the kitchen cupboard, not in the fridge. This is because, thanks to its fruit content, it is naturally acidic and therefore less likely to grow any unwanted bacteria.
Can jam be kept out of fridge?
Jams and Jellies Jellies and jams do not need to go in the fridge because they have a water activity of around 0.80, and their pH is usually around 3. So they don't have enough moisture to support bacteria and are too acidic for them as well. Conclusion: Keep your jams and jellies wherever you want to.