How to Store Maple Syrup: Refrigerate After Opening, Freeze for Long-Term
Maple syrup must be refrigerated immediately after opening—no exceptions. Unrefrigerated, pure maple syrup (≥66° Brix, pH 5.5–7.0, water activity <0.82) supports rapid growth of Wallemia sebi, Aspergillus, and Penicillium molds within 3–7 days at room temperature, per FDA BAM Chapter…
