Does Beer Expire? And Other Questions About Expired Beer

Author: ACTenviro
Date: May 31, 2024

You want to use that popular lager you stuck in your fridge for 3 months now. It's time to bring out the booze for that much-anticipated celebration.

But wait! Is that beer expired? Will it go bad? Is it still safe to drink it? Not so fast now, eh?

The truth is, beer doesn't go bad in the way that food does. But it can lose its robust flavors over time. Although it generally won't be dangerous to drink it, a beer past its prime may disappoint your palate.

Let's know more about expired beer, how it "spoils," ways to preserve it, and more! Hold on to your beer mugs!

Can Beer Go Bad?

Have you ever questioned the shelf life of that dusty bottle of beer abandoned in the corner of your fridge? Is it stale? Is it still safe to drink? Is it spoiled?

The answer is, in fact, affirmative. Yes, beer can spoil, but it's a bit more complex than you might anticipate.

What Factors Contribute to Beer Expiration?

Beer, like many other consumables, does have a shelf life and can go bad. However, it doesn’t spoil in the same way as perishable foods and beverages such as milk do. You won't find it turning sour, growing colonies of mold, or turning green. 

What happens is a slow, steady deterioration in its taste and quality over time. Beer can go bad in several ways:

1. Oxidation

When beer comes into contact with oxygen in the brewing process, packaging, or storage, it oxidizes. Meaning, the oxygen reacts with the beer's chemical makeup, breaking down hop oils and other flavor compounds.

Effects on Beer

  • Flavor: Off-flavors such as a cardboard-like or stale taste
  • Aroma: Reduced aroma. The beer loses its fresh, inviting scents.
  • Color: Some beers may darken as a result of oxidation.

2. Skunking

Beer, especially those in clear or green bottles, can become "skunky" when exposed to UV light due to a photochemical reaction between UV light and hop compounds in the beer.

Effects on Beer

  • Aroma: The beer develops a distinctive sulfur-like smell reminiscent of stinky skunk spray.
  • Flavor: The skunky aroma has a corresponding off-flavor like sulfur.

3. Microbial Contamination

Commercial beers are well-pasteurized and filtered. However, improper brewing practices (usually stems from DIY brewing), packaging errors, or poor storage conditions can lead to bacterial contamination. Unintended wild yeast infestations can also contaminate beer, especially in homebrews or improperly sealed commercial brews.

Effects on Beer

  • Flavor: Contaminated beer can taste sour, musty, or metallic.
  • Appearance: The beer may become cloudy or develop unexpected sediment.

4. Temperature Fluctuations

High temperatures accelerate chemical reactions, which break down the delicate flavor compounds. On the other hand, freezing can cause the beer to expand, potentially breaking the container and introducing oxygen upon thawing.

Effects on Beer

  • Flavor: Heat can cause beer to taste stale or cooked while freezing can result in off-flavors.
  • Carbonation: Temperature fluctuations can affect the beer's carbonation, leading to flat or overly fizzy beer.

5. Time

Over time, all beer will undergo chemical changes that alter its flavor, aroma, and mouthfeel.

Effects on Beer

  • Flavor and Aroma: Aging causes the aromas and hop flavors to mellow down. The malt flavor becomes stronger. This is desirable for some people. But for others, it can mean a loss of the beer's intended profile.
  • Appearance: Older beer may develop a hazy appearance or unexpected sedimentation.

How Long Does Beer Last?

How long can a beer retain its best taste and quality?  The longevity of beer depends on several factors. 

1. Unopened Beer

A. Bottled and Canned Beer

  • Commercially produced beer:
    • Standard lagers and ales: These beers generally have a shelf life of 6 to 12 months past the printed expiration date when stored in a cool, dark place.
    • High-ABV beers (e.g., Barleywines, Imperial Stouts): These beers can last for years. Similar to wine, these beers improve with age due to the stabilizing effect of higher alcohol content.
  • Craft Beer:
    • Pale ales and IPAs: Best consumed within 3 to 6 months to enjoy the peak of their hop character. Hoppy flavors diminish over time.
    • Sours and wild ales: These beers can last several years with flavors evolving as the years go by.

B. Kegged Beer

  • Pasteurized kegs: Typically, these beers last 3 to 6 months if kept refrigerated.
  • Unpasteurized kegs: These are best consumed within 6 to 8 weeks as they are more susceptible to spoilage.

2. Opened Beer

A. Bottled and canned beer:

  • After opening: Bottled or canned beers should be consumed within a day or two. Exposure to air causes oxidation, leading to stale flavors.

B. Growlers

  • Once opened: These beers are best consumed within 24 to 48 hours to maintain freshness.
  • Sealed but unopened: Unopened cans or bottles of beer can last up to a week in the refrigerator. However, this varies based on the type of beer and filling method.

C. Crowlers (32oz Canned Growlers)

  • Unopened: Typically lasts up to a month when kept refrigerated.
  • Once opened: These should be consumed within a day or two.

3. Specific Beer Types

A. Light Beers (e.g., Pilsners, Pale Lagers):

  • Shelf life: 6 to 12 months unopened. This is best consumed within 3 to 6 months for peak flavor.

B. Dark Beers (e.g., Stouts, Porters):

  • Shelf life: 1 to 2 years unopened. It can improve with age due to malt-forward flavors.

C. Hoppy Beers (e.g., IPAs, Pale Ales)

  • Shelf life: 3 to 6 months unopened for best hop character. It can last up to a year but with diminished hop intensity.

D. High-ABV Beers (e.g., Barleywines, Belgian Quads)

  • Shelf life: Several years. It often improves with age due to high alcohol content.

E. Sour and Wild Ales:

  • Shelf life: Several years; Flavors continue to evolve.

How Do I Identify Spoiled Beer?

an image of a beer

You've got the know-how to keep your beer fresh, but what if it's already spoiled? Your senses are your best guide here! Knowing the signs of a bad beer is vital for all beer aficionados.

1. Off-flavors and Aromas

  • Skunky or sulfuric: A skunky smell, reminiscent of skunk spray, is a clear sign that the bear is lightstruck, or exposed to UV light.
  • Stale or cardboard-like: Oxidation causes beer to develop a stale, cardboard-like flavor. 
  • Sour or vinegary: While some beers are intentionally sour, an unexpected sour or vinegary taste in non-sour beers indicates bacterial contamination.
  • Metallic: A metallic taste indicates contamination or poor-quality packaging materials.
  • Musty or moldy: A musty or moldy flavor may mean mold from improper storage.

Changes in Aroma

  • Faded aroma: If the beer’s aroma is weak or has faded significantly, it may have aged poorly or been improperly stored.
  • Unpleasant odors: Any unexpected or unpleasant smells such as rotten eggs, band-aid, or dampness suggest spoilage or contamination.

2. Appearance


  • Unexpected haze: While some beers such as wheat beers and certain IPAs are naturally hazy, an unexpected cloudiness in a previously clear beer may mean it's spoiled.
  • Sediment: Excessive sediment or floaties in the beer can be a sign of spoilage. However, some unfiltered beers naturally contain sediment.

Color Changes

  • Darkening: Beer that has darkened significantly from its original color may have oxidized or aged poorly.
  • Discoloration: Unusual colors, such as a murky brown in a light beer, may suggest contamination.

3. Carbonation and Head Retention

Poor Carbonation

  • Flat Beer: If the beer pours with little to no head and lacks carbonation, it may have gone flat due to age or improper sealing.
  • Over-Carbonation: Conversely, if the beer is overly fizzy or foamy, it might have undergone unwanted secondary fermentation. In this case, microbes are the culprit.

Head Retention

  • Lack of foam: Fresh beer typically has a good head when poured. If the beer has little to no foam, it may be stale.

4. Mouthfeel

Changes in Texture:

  • Thin or watery: Beer that tastes thin or watery may have lost its carbonation or has degraded.
  • Syrupy or thick: If a beer feels overly thick or syrupy, it might have aged improperly or suffered from contamination.

What Are Some Easy Steps to Assess Beer Quality?

  1. Examine the bottle or can: Check the packaging for any signs of damage or improper sealing. Look for the best before date to gauge freshness.
  2. Pour and inspect: Pour the beer into a clear glass to examine its appearance and carbonation. Smell the beer. Are there any off-aromas?
  3. Taste the Beer: Take a small sip to determine the flavor, mouthfeel, and overall quality. Does it have off flavors or unexpected tastes?

Is Expired Beer Hazardous?

Is drinking an expired beer dangerous? The short answer is typically not. When beer goes past its 'best-before' or 'sell-by' date, it doesn't necessarily become unsafe to consume. Expired beer is generally not hazardous in the same way as spoiled food or dangerous chemicals. However, it can be unpleasant and undesirable to drink. Still, the taste may begin to decline, which can lessen your enjoyment.

Let's understand why stale beer isn’t usually dangerous and what you should consider when dealing with it.

1. Microbial Safety

Commercial Brewing Standards

  • Pasteurization: Most commercial beers are pasteurized, which kills harmful bacteria and pathogens.
  • Filtration: Many beers are also filtered to remove yeast and other potential contaminants.

Homebrew Risks

  • Sanitation: Homebrewed beer may carry a higher risk of contamination if proper sanitation practices are not followed. However, even in these cases, the risk of harmful bacteria is relatively low if the beer is brewed correctly.

Safety Concerns

  • Pathogens: Harmful pathogens that cause foodborne illnesses, like Salmonella or E. coli, do not thrive in beer due to its alcohol content and pH level.
  • Mold: If mold is present, it’s a sign of contamination. However, it is unlikely to cause serious harm if accidentally ingested in small amounts. It’s best to avoid consuming any moldy product though.

2. Chemical Safety

Oxidation: Oxidation can cause beer to taste stale or cardboard-like. But it does not make the beer unsafe to drink.

Light Exposure: Exposure to UV light can cause the beer to develop a somewhat sulfuric flavor. It is unpleasant but not dangerous.

3. Alcohol Content

Preservative Effect: The alcohol content in beer acts as a natural preservative that prevents or inhibits the growth of harmful microorganisms.

Degradation: The alcohol content does not significantly degrade over time, so the beer remains stable from a microbial safety standpoint.

How Do I Dispose of Stale Beer?

an image of beer drums in a warehouse

Expired or stale beer disposal can be done easily. Let's check out some ways:

1. Down the Drain

  • Pour slowly: Pour the stale beer slowly down the drain to prevent foaming and splashing.
  • Flush with water: Run water from the tap simultaneously to dilute the beer and prevent any lingering odor in your sink or pipes.


  • Environment: The good thing is beer is biodegradable.  Pouring small amounts down the drain is generally safe for household plumbing and the environment.
  • Septic systems: If your home has a septic system, avoid disposing of large quantities at once. This prevents overloading the system.

2. Composting

  • Mix with compost materials: Beer can be added to a compost pile or bin. Pour it evenly over compost materials such as grass clippings, leaves, or kitchen scraps.
  • Turn the compost: Mix the beer into the compost to distribute moisture and nutrients evenly.


  • Nutrient addition: Beer adds moisture and some nutrients to the compost. Your compost decomposes better.
  • Moderation: Use beer in moderation to avoid making the compost too wet.

3. Fertilizing Plants

  • Dilute the beer: Mix the stale beer with water at a ratio of 1:1 or higher to dilute the alcohol content.
  • Water plants: Use the diluted beer mixture to water non-edible plants or lawns so that the yeast and nutrients in beer can fertilize the soil and improve plant growth.


  • Edible plants: Avoid using beer on edible plants or vegetables to prevent any potential contamination.
  • Moderation: Use this method sparingly to avoid over-fertilizing or harming plants with excessive alcohol.

4. Household Uses


  • Metal polishing: Expired beer makes a great stain remover. Use stale beer to polish brass or copper items. Soak the items in beer for a few minutes then wipe them clean with a soft cloth.
  • Stain removal: Beer can help remove stains from fabric. Dab the stale beer onto the stain, let it sit, and then wash it as usual.

Pest Control

  • Slug traps: Pour stale beer into shallow containers and place them in your garden. Slugs are attracted to beer and will crawl into the container and drown.

5. Disposal in Trash


  • Empty containers: Pour the beer out of bottles or cans before recycling the containers.
  • Seal the beer: If disposing of large quantities, seal the beer in a container to prevent spills and odors in your trash bin. Get in touch with providers such as ACTenviro for transportation and disposal of the trash. They also provide recycling services to process the empty cans and bottles.


  • Recycling: Make sure that the bottles and cans are clean before placing them in the recycling bin.

What Are Some Best Practices for Storing Beer?

Proper beer storage is key to maintaining its optimal flavor. Even though it's a manly drink, beer is a fragile liquid that needs specific conditions to maintain its freshness, flavor, and overall quality. Here are some best practices for storing beer:

1. Temperature Control

Ideal storage temperature: Store beer at a consistent temperature between 45 and 55°F (7 and 13°C).

  • Serving temperature: Different styles of beer have optimal serving temperatures:
    • Lagers: 40-45°F (4-7°C)
    • Ales: 45-55°F (7-13°C)
    • High-ABV Beers: 55-60°F (13-16°C)

Avoid temperature fluctuations: Keep beer at a stable temperature to prevent rapid aging and degradation. High temperatures can hasten oxidation and spoilage.

2. Light Protection

Avoid direct light: Store beer away from direct sunlight and fluorescent lights. Use a dark, cool place like a cellar or a closet for storage.

Packaging: Brown bottles offer better protection against UV light compared to clear or green bottles. Aluminum cans provide excellent protection against light.

3. Positioning

Upright storage: Store beer bottles upright to minimize the surface area exposed to air inside the bottle. Keeping bottles upright helps the sediment settle at the bottom.

4. Humidity Control

Moderate humidity: Store the beer in an environment with moderate humidity to prevent labels from peeling and mold from growing.

5. Age-Appropriate Storage

Know Your Beer: Beers like IPAs and pale ales are best consumed right away to enjoy their hop character. High-ABV beers (e.g., barleywines, imperial stouts) and sour ales, on the other hand, can improve with age.

Cellaring: If cellaring beers for extended periods, ensure the storage area is cool, and dark, and maintains a consistent temperature.

6. Avoid Contaminants

Clean Environment: Store beer away from strong odors (e.g., chemicals, cleaning products) to prevent flavor contamination. Ensure the storage area is clean and free of pests that could damage packaging.

Additional Tips

1. Rotation: Use the "First In, First Out" method. Consume older beers first.

2. Labeling: Label and date beers when storing them to keep track of their age and optimal consumption window.

3. Avoid Vibration: Store beer in a stable location away from frequent vibrations, which can disturb sediment and affect carbonation.


Beer does have an expiration date. It's not a hard and fast rule, but the flavor can deteriorate over time, especially if it's exposed to unfavorable conditions like high temperatures or bright light. Drinking expired beer isn't typically harmful, but it can certainly dull the pleasure of sipping a refreshing brew.

A well-cared-for beer can offer you a delightful, refreshing taste each time you pop a cap. Cheers!


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