How Long Does Maple Syrup (Opened) Last?
Opened real maple syrup (not pancake syrup).
The Short Answer
Maple Syrup (Opened) lasts 365–365 days in the refrigerator when stored properly at 40°F or below. These times are based on USDA food safety guidelines and assume proper storage conditions.
Storage Times at a Glance
Source: USDA FoodKeeper | Last verified: March 19, 2026
Real maple syrup MUST be refrigerated after opening. Unlike the corn syrup-based pancake syrup, real maple has no preservatives and will grow mold at room temperature. If mold appears, skim, boil, and it is fine.
How to Store Maple Syrup (Opened)
Refrigerate after opening. Real maple syrup can grow mold if left at room temperature. If mold appears on the surface, skim it off, boil the syrup briefly, transfer to a clean container, and refrigerate.
How to Tell if Maple Syrup (Opened) Has Gone Bad
Look for these signs that maple syrup (opened) has spoiled: mold on the surface (common and recoverable), fermented smell, cloudy appearance, off taste.
The Professor's rule: When in doubt, throw it out. No meal is worth food poisoning.
The Bottom Line
Properly stored maple syrup (opened) stays safe for 365–365 days in the fridge. Always store in airtight containers, refrigerate within 2 hours of purchase or preparation, and trust your senses. If something looks, smells, or feels off, discard it regardless of how many days it has been.
Frequently Asked Questions
Yes. Unlike mold on bread, maple syrup mold sits on the surface. Skim it off, bring the syrup to a brief boil to kill any remaining spores, transfer to a clean container, and refrigerate.