How Long Can Whisky Last Once Opened? – Let’s Find Out

When it comes to opening a bottle of whisky for cocktail night or for a tasting experience, the one question that most commonly arises is: how to store the open whisky bottle? The next doubt to crop up is how long the whisky will last once the bottle is opened, that is, how long before its flavours start to flatten out and its aroma loses its intensity. These are very common questions which come from queries relating to how big a bottle of whisky one should buy, especially if it is too cumbersome to store for later.

Cutting to the chase, here is a breakdown of some of the more frequently asked questions around storing whisky and how long it lasts for once a bottle is opened:

Put simply, whisky doesn’t go bad like milk or juice would when it is opened. What happens instead is that once whisky is exposed to oxygen, moisture and light, its aromas, textures and flavours get affected. A whisky that has been left open for too long begins to lose some of its more interesting flavours.

The rule of thumb is that the more space in a bottle for oxygen, the faster the whisky’s flavours deteriorate. A whisky bottle that is three-quarters full can last for at least a couple of years when stored in a bar cabinet, with little exposure to moisture. Half a bottle of whisky can last for up to a year, and when the bottle is only a quarter full, 6 months are enough for the whisky to become flat.

Quite a few things. First, the aroma of the whisky when left open for too long begins to fade. This affects the whisky tasting experience in spades. Second, over time, flavours and aromas begin to shift and flatten out – peaty and smoky notes begin to taste musty and dull and floral accents get mellowed down. Even the spirit’s robust effect can lose out on its characteristic potency when its bottle is left open for too long.

Yes, here are some of the ways to keep opened whisky fresh for longer: 

– Keep the bottle tightly sealed to avoid moisture from entering 

– Store the bottle upright to avoid any contact with a high-proof liquid

– Avoid exposure to direct heat and sunlight

– Use smaller bottles and decant only the required proportion to reduce oxygen exposure

Storing whiskies in refrigerators may make them hazy and cloudy, and also dull some of their more robust flavours. So, avoid storing opened bottles of single malts or peaty Scotches in the fridge. Instead, decant whisky as and when required and place the bottle on a bar shelf. 

No. It is a very common myth that opening a bottle of whisky stops the ageing process. In fact, bottling has nothing to do with ageing. Whisky stops ageing once it is removed from its cask and put into a bottle. After that, an open bottle of whisky maintains the same finished flavours until they too begin to go dull.

If a whisky starts to smell musty and dull and begins to taste flat or overly woody, it is an indication that the spirit has gone off. A papery mouthfeel is one of the best indicators to spot a whisky that is no longer fresh.

Drink Responsibly. This communication is for audiences above the age of 25.