In Some Cases, Syrups can be Kept at Room Temperature Without Adverse Effects.
The vast majority of syrups can be stored in the pantry, but the potency of some of them may diminish over time. It is recommended that they be kept in their original packaging for a period of one year. The preservatives in some products are so potent that they can be stored for years. The only product that differs between the two is pure maple syrup.
Pure maple syrup can be stored in the refrigerator for up to a year after the container has been opened, while other types of syrup can be stored in the cupboard for up to 18 months. Syrups can go bad after being stored for an extended period of time.