- How long does vermouth last once opened? The answer to that question depends to a large extent on storage conditions - keep bottle tightly closed when not in use.
To maximize the shelf life of opened vermouth, keep the opened bottle of vermouth in the refrigerator.
How long does opened vermouth last in the refrigerator? An opened bottle of vermouth will usually keep well for about 5 months in the refrigerator.
How to tell if an opened bottle of vermouth has gone bad? The best way is to smell and look at the vermouth: if vermouth 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