Beer doesn't "expire" dangerously, but it does go stale and lose its best flavors fast if you store it wrong. Three rules keep it at its best.
Cold
Heat is beer's enemy — it ages beer quickly and creates off-flavors. Store it cold, or at least cool and stable. Avoid a hot garage or a sunny shelf.
Dark
Light, especially UV, causes "skunking" — that unpleasant, well, skunky smell — in minutes for beer in clear or green bottles. Keep beer in the dark; cans and brown bottles protect best.
Upright
Store bottles upright, not on their side. It minimizes oxidation at the surface and keeps any yeast sediment settled at the bottom (helpful for a clean pour).
Drink fresh — mostly
Most beer, especially hoppy IPAs, is best fresh — hops fade within weeks. Check the packaging date and drink hop-forward beers young. A few high-alcohol styles (imperial stouts, barleywines, some sours) can improve with age, but they're the exception.
Quick answer: does beer go bad?
It won't make you sick, but it goes flat, stale, or skunky. Cold, dark, upright, and drunk reasonably fresh is the whole secret.
FAQ
Should beer be stored upright or on its side?
Upright. It reduces oxidation at the surface and keeps yeast sediment settled at the bottom for a cleaner pour.
Does beer go bad?
It won’t make you sick, but it goes stale, flat, or skunky with heat and light. Store cold and dark, and drink hoppy beers fresh.