How can you tell if Beer (opened) has gone bad?

Signs that Beer (opened) has gone bad: Flat (no fizz), skunky or wet-cardboard smell, sour or vinegar taste; Sealed beer that's expired may be flat but usually safe.

What does the date label on Beer (opened) mean?

Beer (opened) usually carries a "Best By" date. A quality marker — the product is at peak quality before this date, but it’s safe to eat afterward if stored correctly. See our date-labels guide for the full breakdown.

Beverages

How long does Beer (opened) last?

Q: How long does Beer (opened) last?

In the fridge: ~1 day. Sealed / unopened: 3–6 months. Opened beer goes flat quickly. Drink same day. Sealed craft beer: 3–6 months past printed date.

High confidence Quality concern

How long does Beer (opened) last? fridge ~1 day. Plus spoilage signs, sources, and an unopened-vs-opened note.

Fridge

~1 day

Pantry

Refrigerate only

Freezer

Not recommended

Sealed / unopened: 3–6 months

Signs Beer (opened) has gone bad

Flat (no fizz), skunky or wet-cardboard smell, sour or vinegar taste.
Sealed beer that's expired may be flat but usually safe.

Discard immediately if

Smells strongly like vinegar
Has been open more than 5 days (wine) or 1 day (beer)
Tastes sharply sour or rancid

Why guidance varies

Pasteurization method (HTST vs. UHT vs. cold-pressed), preservative content, and container type (carton vs. plastic vs. glass) all change shelf life dramatically.

Track this in My Pantry

Get a heads-up before it expires. Search the full database instead.

Sources for this answer

A USDA FoodKeeper — Storage windows and refrigeration guidance for this category.
A FDA — Are You Storing Food Safely? — Date-label interpretation and food-safety baseline.

Reviewed: 2026-05 · Rule: if manufacturer storage instructions are stricter than category guidance, the manufacturer instructions win.