How Long Does Tequila Last Opened. How long does tequila last? Once a bottle is opened, the contents may slowly start to evaporate or eventually oxidize.
But tequila can go bad. Unopened will last just like any other tequila, hence forever. Once opened, tequila should be enjoyed within a year.
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Do a smell and (small) taste test before drinking any questionable liqueurs. Can an open bottle of tequila go bad? A cool place preserves your tequila longer. This really depends on the margarita mix.