Does Maple Syrup Expire?
Unopened pure maple syrup lasts indefinitely in the pantry. Once opened, it should be refrigerated and will last 1 year or longer. Maple syrup can develop mold on the surface, but this is not necessarily a reason to discard it - the mold can be skimmed off and the syrup boiled.
Key Takeaways
- Pure maple syrup has a high sugar content that acts as a natural preservative.
- Pancake syrup (corn syrup-based) has different storage properties and longer ambient shelf life than pure maple syrup.
- Freezing maple syrup extends its life indefinitely; it will not freeze solid due to sugar content.
Explanation
Pure maple syrup has a high sugar content that acts as a natural preservative. Unopened and properly sealed, it can last for years in a cool, dark place. The expiration dates on bottles are quality guidelines, not safety cutoffs.
Once opened, maple syrup should be refrigerated to prevent mold growth. Even with refrigeration, mold can eventually appear on the surface. Unlike mold on other foods, this surface mold is not dangerous because it cannot penetrate the syrup.
If you find mold on maple syrup, skim it off completely, pour the syrup into a clean pot, bring it to a boil to kill any remaining spores, then transfer to a clean container. Alternatively, if the mold is extensive or you are uncomfortable, you can discard it.
Things to Know
- Pancake syrup (corn syrup-based) has different storage properties and longer ambient shelf life than pure maple syrup.
- Freezing maple syrup extends its life indefinitely; it will not freeze solid due to sugar content.
- Crystallization in maple syrup is not spoilage - gentle heating will dissolve the crystals.