An unopened bottle of tequila has an indefinite shelf life, which means it won’t ever really expire. But once that bottle is opened, it will remain at peak quality for 1 year. After that, it’s likely to decline in smell, flavor and appearance.
If the tequila is stored improperly, it could affect the flavor; if it smells sour or off, it’s probably best to toss it. Read our article to learn more about how to properly store tequila.