- How long does an unopened bottle of vermouth last? The precise answer depends to a large extent on storage conditions - to maximize the shelf life of unopened vermouth, store in a cool, dark area, away from direct heat or sunlight.
How long does unopened vermouth last at room temperature? Most vermouths are at their best quality within 3 to 4 years of production, although they will stay safe indefinitely if properly stored.
How to tell if 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