Although vermouth will keep indefinitely, the product does turn flat or flavorless overtime. When the product is not kept properly or if the storage environment is less than ideal, the product loses its aroma and flavor. Other times, a leaky or poorly sealed bottle accelerates the flavor loss.

How long does Cinzano last once opened?

Opened bottles of dry vermouth will last up to 1 month when stored in the fridge, while opened bottles of sweet vermouth can be enjoyed within 2 months of opening.

Does an unopened bottle of vermouth go bad?

An unopened bottle of sweet vermouth lasts for approximately 3-4 years if properly refrigerated, while an opened bottle would last a good 2 months. This applies to good quality vermouth and not just any vermouth. Vermouth being fortified does last for a longer amount of time than other kinds of wine.