Yes, Your Maple Syrup Can Go Bad, Here’s How to Check

updated Mar 6, 2021
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Credit: Joe Lingeman

The other day, a friend of ours sat down to a meal of pancakes for dinner. She poured on the maple syrup, took a bite and then realized that the inside of the syrup bottle was covered in yellowish-gray mold. So much for that comfort food dinner! When she showed us the bottle, we were stumped. Having been under the impression that maple syrup doesn’t spoil, we wanted to look in to the matter.

Unlike honey, which basically lasts forever, maple syrup does need to be stored correctly after opening or it risks spoiling. Here’s what you need to know about breakfast’s favorite syrup.

(Image credit: Samantha Bolton)

Does Maple Syrup Go Bad?

As it turns out, maple syrup does have a shelf life once opened, and mold is not as uncommon as we thought. StillTasty.com indicates that 100 percent pure maple syrup should keep for a year unopened in the pantry, a year opened in the refrigerator, and indefinitely in the freezer. Other “syrups”, like pancake syrups made of corn syrup with maple flavoring, have a different shelf-life all together.

How to Store Maple Syrup

According to the Massachusetts Maple Producers Association, unopened maple syrup will keep indefinitely, but it must be refrigerated once opened. As for mold, the MMPA says, “If any harmless mold should form on the surface, merely bring the syrup to a slight boil, skim the surface, and pour into a clean container and refrigerate.” We haven’t tried this ourselves, and are reluctant to recommend it unless you know exactly what kind of mold you have and whether it is truly harmless. Do any of our readers have experience with this?

In addition to refrigerating opened maple syrup, the Vermont Maple Sugar Makers’ Association recommends storing unopened maple syrup in a cool place. For long term storage, the Association says that maple syrup retains its flavor best when kept in the freezer (it will not freeze solid).