Updated at: 29-07-2023 - By: John Lau

Are you wondering how long that keg of beer in your basement will last? It’s a common concern, especially for those who love their brews but don’t want to waste any precious pints.

But did you know the lifespan of a keg can be influenced by various factors like type of beer and storage conditions?

This article will guide you through these aspects so you can maximize the freshness and flavor of your draft beers.

Let’s tap into it!

Factors Affecting the Lifespan of a Keg

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The lifespan of a keg can be influenced by several factors, including the type of beer (pasteurized vs. unpasteurized), storage temperature, and dispensing method (manual pump vs. kegerator with CO2).

Type of beer (pasteurized vs. unpasteurized)

The type of beer – pasteurized or unpasteurized – plays a significant role in how long a keg lasts. Pasteurized beers undergo a heat treatment to kill bacteria and extend their shelf life, allowing them to stay fresh for up to six months when stored correctly.

These beers are considerable crowd-pleasers due to their extended shelf life, making them the preferred choice for many pubs and establishments. Contrastingly, non-pasteurized beers do not go through this process, which shortens their lifespan considerably.

Regardless of optimal storage conditions, these types can typically remain fresh only for about two months inside a keg. Despite the shorter lifespan, non-pasteurized beers offer robust flavors appreciated by craft beer connoisseurs who value quality over quantity.

Storage temperature

The temperature at which you store your keg plays a crucial role in its lifespan. A key factor in maintaining the freshness and quality of your keg beer is keeping it stored at the right temperature.

Ideally, you should aim to store your kegs between 36°F (2°C) and 40°F (4°C). This range ensures that the beer stays cool enough to prevent spoilage but not too cold to affect its taste.

Exposing the keg to higher temperatures can cause the beer to deteriorate more quickly, leading to off-flavors and a shorter shelf life. On the other hand, storing it at lower temperatures may result in an overly chilled beverage that doesn’t showcase its intended flavors properly.

Dispensing method (manual pump vs. kegerator with CO2)

The dispensing method used for a keg can significantly affect its lifespan. When it comes to manual pumps, the beer is typically exposed to air during the pumping process, which can lead to faster oxidation and spoilage.

As a result, kegs tapped with manual pumps may have a shorter shelf life compared to those dispensed using a kegerator with CO2. Kegerators with CO2 systems help maintain proper pressure and prevent excessive exposure to oxygen, keeping the beer fresher for longer.

This means that if you’re looking to extend the lifespan of your keg, using a kegerator with CO2 is generally recommended over manual pumps. So, keep this in mind when choosing how you want your beer dispensed from the keg.

Shelf Life of Different Types of Beer in a Keg

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Mass-produced beers typically have a shelf life of 4-6 months in a kegerator, while the shelf life of craft beers can vary greatly.

Mass-produced beers: 4-6 months

Mass-produced beers, which are typically found in most kegerators and enjoyed by many beer enthusiasts, have a shelf life of about 4-6 months when stored in optimal conditions. This means that you can savor the crisp taste and refreshing flavor for an extended period before it starts to lose its freshness.

So, whether you’re hosting a party or simply enjoying a cold one at home, rest assured knowing that your keg of mass-produced beer will last for several months without compromising its quality.

Cheers to that!

Craft beers: varies

Craft beers, unlike mass-produced ones, do not have a set shelf life in a keg. The longevity of craft beer can vary greatly depending on factors such as the style of beer, ingredients used, and brewing techniques.

Some craft beers are highly hopped or contain live yeast cultures that continue to evolve and develop flavors over time. This means that while some craft beers may stay fresh for several months in a keg, others may start to lose their optimal taste and aroma after just a few weeks.

It’s important to check with the brewery or consult the specific beer’s label for guidance on how long it will remain at its best in a keg. Keeping craft beer stored at the proper temperature and serving it promptly is key to preserving its quality for as long as possible.

Tips to Extend the Lifespan of a Keg

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To extend the lifespan of a keg, it is essential to adhere to the manufacturer’s shelf life guidelines, regularly clean gas and beer lines, and properly tap and store the keg.

Observe manufacturer’s shelf life guidelines

To ensure that your keg beer stays fresh for as long as possible, it’s essential to follow the manufacturer’s shelf life guidelines. Here are some key tips to keep in mind:

  • Check the expiration or best before date on the keg. This will give you a clear indication of how long the beer is expected to stay fresh.
  • Store the keg at the recommended temperature. Different types of beer have different temperature requirements, so make sure to follow the manufacturer’s guidelines. Keeping the keg at the optimal temperature will help preserve its freshness for a longer period.
  • Avoid exposing the keg to direct sunlight or extreme temperatures. Heat and light can accelerate the aging process of beer and affect its taste and quality.
  • Handle the keg carefully during transportation and storage. Rough handling can cause agitation and impact the carbonation level of the beer.
  • Keep gas and beer lines clean. Regularly cleaning these components will prevent any build-up that could negatively affect the flavor and quality of your beer.
  • Use a proper dispensing method. A manual pump system may introduce more air into the keg, shortening its lifespan. Investing in a kegerator with CO2 is recommended for extending the freshness of your keg beer.

Clean gas and beer lines regularly

To ensure the longevity and freshness of your keg beer, it’s important to clean the gas and beer lines regularly. This helps prevent any build-up of bacteria or residue that could affect the taste and quality of your beer. Here are some simple steps to follow for cleaning:

  1. Disconnect the keg from the tap system and remove any remaining beer from the lines.
  2. Mix a solution of warm water and a designated line cleaning chemical according to the manufacturer’s instructions.
  3. Attach one end of a cleaning brush (specifically designed for beer lines) to a long flexible nylon tube, and insert it into one end of the line.
  4. Push the brush through the line, ensuring it reaches all corners and bends, while also gently scrubbing to remove any build-up.
  5. Repeat this process with each line connected to your dispensing system.
  6. After cleaning, rinse the lines thoroughly with clean water until no traces of cleaning solution remain.
  7. If possible, use an air compressor or CO2 pump to blow out excess water from the lines. This helps prevent moisture-related issues that could impact your keg’s lifespan.
  8. Once fully dried, reconnect your keg to the tap system and resume dispensing fresh, clean beer.

Properly tap and store the keg

To ensure the longevity and freshness of your keg, it is essential to tap and store it properly. Here are some tips to help you do just that:

  1. Clean the tap system: Before tapping the keg, make sure the tap system is clean and free from any residue or contaminants. This will prevent any off-flavors or spoilage.
  2. Use a CO2 system: If possible, use a kegerator or a dispensing method that utilizes CO2 instead of manual pumps. CO2 helps maintain carbonation and prevents oxidation, which can negatively affect the beer’s flavor.
  3. Handle with care: When tapping the keg, handle it gently to avoid excessive agitation or introducing air into the keg. This will help preserve the beer’s freshness and prevent premature spoilage.
  4. Store at proper temperature: The storage temperature plays a crucial role in extending the lifespan of your keg. Keep it refrigerated between 38-40°F (3-5°C) for best results. Avoid temperature fluctuations as they can impact beer quality.
  5. Protect from light: Beer is sensitive to light exposure, so make sure your keg is stored in a cool and dark place, away from direct sunlight or bright artificial lights.
  6. Maintain cleanliness: Regularly clean both the gas and beer lines to remove any buildup that could affect beer quality or cause contamination. Follow manufacturer guidelines for cleaning procedures.
  7. Rotate stock: If you have multiple kegs, rotate them regularly to ensure older ones are consumed first while they are still fresh.


In conclusion, the lifespan of a keg can vary depending on several factors such as the type of beerstorage temperature, and dispensing method. Pasteurized beers typically last around 90-120 days, while craft beers may have more unpredictable shelf lives.

To extend the longevity of your keg, it’s important to follow manufacturer guidelines, regularly clean gas and beer lines, and store the keg properly. By taking these steps, you can ensure that your keg stays fresh for as long as possible.