Simple syrup lasts in the fridge for about 2 weeks to 1 month if it is a standard simple syrup (1:1 sugar to water ratio) stored in an airtight container. A thicker or richer simple syrup (2:1 sugar to water) can last up to 6 months in the fridge. Flavored syrups with fresh ingredients typically last a shorter time, about 1 to 2 weeks, while plain homemade syrups are good for about a month. Commercial store-bought syrups may last even longer, up to 6 months or more when refrigerated. For best preservation, store the syrup in a sterile airtight glass container in the fridge.
