When it comes to vermouth, it's important to know how long it lasts once it's been opened. As a sommelier and brewer, I have had my fair share of experience with vermouth, and I can tell you that it's best to store it in the refrigerator once it has been opened.
The reason for this is that vermouth is a fortified wine that contains botanicals and herbs. These ingredients can be delicate and can start to degrade once the bottle is opened and exposed to air. By storing it in the refrigerator, you can slow down this process and extend the shelf life of your vermouth.
In general, once opened, vermouth will stay in good shape for about a month. During this time, you can continue to enjoy its flavors and use it in your favorite cocktails. However, after a month, the quality may start to decline. The flavors may become less vibrant, and the overall taste may not be as enjoyable as when it was first opened.
That being said, vermouth can still be used for up to two months after it has been opened. While the quality may not be top-notch, it will still be passable and can be used in cocktails or recipes that call for vermouth. Just keep in mind that the flavors may not be as pronounced, so you may need to adjust the proportions in your recipes accordingly.
If you find that you can't use up your vermouth within three months, it's a good idea to either invite some friends over or give it away. Sharing is caring, and it's always more enjoyable to enjoy a drink with friends. Plus, it's a great opportunity to introduce them to the world of vermouth and experiment with different cocktails together.
To summarize, once opened, vermouth will last in good shape for about a month when stored in the refrigerator. It can still be used for up to two months after that, although the quality may start to decline. If you can't use it up within three months, it's best to share the joy with others. So, remember to store your vermouth in the refrigerator and savor its flavors while it's at its best. Cheers!