Yes, even organic maple syrup has a shelf life, although it's quite long if stored correctly. The length of time it remains good depends on whether it's opened or unopened and how it's stored.
Shelf Life of Maple Syrup:
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Unopened: A sealed bottle of 100% pure maple syrup can last for several years, even indefinitely, when stored in a cool, dark, and dry place. For optimal quality beyond two years, freezing is recommended. [Source: Saratoga Maple, Maple From Canada, Anderson's Maple Syrup]
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Opened: Once opened, the shelf life significantly shortens. To maintain quality and prevent spoilage, store opened maple syrup in the refrigerator. In the refrigerator, it should last for about a year. Freezing also extends the life of opened syrup indefinitely. [Source: StillTasty.com, Maple Farmers, Carman Brook Farm, Cozymeal]
Factors Affecting Shelf Life:
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Purity: 100% pure maple syrup generally lasts longer than syrups with added ingredients.
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Storage: Proper storage is crucial. Avoid exposure to heat, light, and moisture. An airtight container is recommended, especially for opened syrup.
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Mold: While rare, mold can occur in maple syrup, especially in opened containers that are not properly stored. If mold is present, discard the syrup. [Source: StillTasty.com, The Kitchn]
Important Note: While some sources suggest maple syrup can last indefinitely, freezing it after opening is the safest method for extending shelf life and maintaining its quality. Discard any syrup showing signs of spoilage (mold, unusual odor, or change in texture).
