As a sommelier and brewer, I can assure you that vermouth does have a shelf life and can go bad if not stored properly. Vermouth is a fortified wine that is infused with various botanicals and herbs, giving it its distinct flavor. Like any other wine, vermouth can spoil over time.
The shelf life of vermouth largely depends on how it is stored. Once you open a bottle of vermouth, it is essential to store it in the refrigerator. The cool temperature helps slow down the oxidation process and preserves the flavors and aromas of the vermouth.
Typically, an opened bottle of vermouth will stay in good shape for about a month when refrigerated. During this time, you will still be able to enjoy its full flavor profile and use it for cocktails or cooking. However, after the first month, the vermouth may start to lose some of its vibrancy and freshness.
From the second month onwards, the quality of the vermouth will gradually decline. While it may still be drinkable, it may not have the same depth of flavor and complexity as when it was first opened. It is important to note that this timeline is a general guideline, and the actual shelf life can vary depending on factors such as the brand, storage conditions, and personal taste preferences.
If you find yourself unable to finish a bottle of vermouth within three months, it is best to find ways to use it up or share it with friends. Hosting a vermouth tasting party or incorporating it into recipes can be a great way to make the most of it. Vermouth can add depth and complexity to dishes like risotto, sauces, and marinades.
In my personal experience, I have encountered vermouth that has gone bad due to improper storage. It had a noticeably off aroma and tasted flat and muted. It was a disappointment, especially considering the potential vermouth has to enhance cocktails and culinary creations.
To summarize, vermouth does have a limited shelf life once opened. Storing it in the refrigerator can extend its freshness for about a month, with passable quality for another month or so. It is recommended to use up the vermouth within three months to fully enjoy its flavors and avoid any potential spoilage. So, be mindful of how much vermouth you purchase and store it properly to ensure the best drinking experience.