How long does a bottle of unopened bourbon last?

An unopened bottle of bourbon whiskey can be stored indefinitely as long as it is kept in a cool, dark place away from direct sunlight and heat sources. The flavor and quality of the bourbon will remain intact for many years. However, once a bottle of bourbon is opened, it should be consumed within a reasonable amount of time. After a few months, the flavor of the bourbon may start to deteriorate as it is exposed to air and oxidizes.