- How long does creme de menthe last? The answer to that question is a matter of quality, not safety, assuming proper storage conditions - when properly stored, a bottle of creme de menthe has an indefinite shelf life, even after it has been opened.
To maximize the shelf life of creme de menthe for quality purposes, store in a cool dry area away from direct heat or sunlight; keep tightly closed when not in use.
Once a bottle of creme de menthe is opened, the contents may begin to evaporate slowly and some flavor may be lost over time, but the creme de menthe will remain safe to consume if it has been stored properly.
How to tell if creme de menthe has gone bad? The shelf life of creme de menthe is indefinite, but if creme de menthe develops an off odor, flavor or appearance, it should be discarded for quality purposes.
Sources: For details about data sources used for food storage information, please click here