Does Tequila Ever Expire?

Like many other distilled spirits, tequila doesn't exactly expire in the traditional sense, so don't rush to open it on that account. However, keep in mind that its quality can change depending on how it is stored. 

Tequila's substantial alcohol content (typically 40% and above) acts as a natural preservative, inhibiting the growth of bacteria and keeping it shelf-stable so the liquor won't spoil like perishable food. Unopened, it can essentially last forever — the key is keeping the bottle away from direct light and heat. But once you've cracked it open, the clock starts ticking in terms of flavor. Generally speaking, tequila should be consumed within a year or so if you want to enjoy it at its best. This is because exposure to oxygen causes oxidation, similar to when wine is left out too long and loses its oomph. In the case of tequila, oxidation can make the blue agave distillate taste lackluster and stale. Consuming it within the suggested timeframe will lessen the chances of flavor deterioration.

There are things you can do to up the chances that your bottle stays as tasty as possible.  Start by storing it in a cool, dark place. Ideally, the temperature should stay between 50 and 68 degrees Fahrenheit, and the bottle should be tightly sealed to prevent air from getting in. To that end, although it may be tempting, if your bottle has a cork top, don't store it on its side like wine. Instead, shake the spirit occasionally to keep the cork moist. If it dries out, it could deteriorate. Dampening it ensures that it stays in good condition and provides a good seal to the bottle. 

Besides taste, you should also pay attention to the aroma and color to ensure your tequila is still in top shape. You can tell the alcohol has gone bad if it tastes unpleasant, the liquid looks cloudy (this tends to happen with barrel-aged spirits like reposado and añejo tequilas), or it smells particularly harsh. If that's the case, it's likely past its prime. On the other hand, if you keep the bottle properly sealed and take care to be mindful of the environmental elements that impact its quality, you can enjoy the smooth taste of your tequila for years to come.