Yes, pure maple syrup can eventually go bad, although its incredibly long shelf life and resistance to spoilage depend heavily on storage conditions. While it won't "expire" in the traditional sense, its quality and safety can degrade over time.
Shelf Life and Storage
- Unopened: 100% pure maple syrup can last for up to a year in a cool, dark pantry. StillTasty.com and multiple other sources confirm this. Some sources even suggest an unopened bottle can last indefinitely when stored properly.
- Opened: Once opened, refrigeration is key. Keep it in the refrigerator for approximately one year to maintain its best quality. StillTasty.com
- Frozen: Freezing pure maple syrup is the best way to extend its shelf life. It can be stored indefinitely in the freezer. StillTasty.com
Signs of Spoilage
While pure maple syrup has natural preservatives, several indicators can signal spoilage:
- Mold: Although less common than you might think, mold growth is possible, especially if the syrup is not properly stored. Discard the syrup if you see any mold. Reddit
- Crystallization: Crystallization at the bottom of the bottle is common and doesn't necessarily mean the syrup is bad. Gently warming the bottle can help dissolve the crystals. MapleFarmers.com
- Off-odors or Changes in Taste/Texture: If the syrup develops an unusual odor, tastes significantly different, or changes texture, it's best to discard it. These are reliable indicators of spoilage.
Proper Storage is Crucial
Storing pure maple syrup correctly is essential to prevent spoilage and maintain its quality. Choose a cool, dark location for unopened bottles, and always refrigerate after opening. Freezing ensures the longest shelf life. Cook's Illustrated, Carman Brook Farm
