How long does beer stay good in a kegerator?

Answered by Michael Blake

As a sommelier and brewer, I have had the opportunity to work with various types of and understand how they age and stay fresh in different storage conditions. When it comes to a kegerator, there are a few factors to consider in determining how long beer can stay good.

1. Beer Style: Different beer styles have varying shelf lives, even when stored in a kegerator. For example, lighter styles such as pilsners and blonde ales tend to have a shorter shelf life compared to stronger and more robust styles like stouts or barleywines. This is because lighter beers often have fewer preservatives and a lower content, making them more susceptible to spoilage over time. On the other hand, higher alcohol beers have better longevity due to their higher alcohol content acting as a natural preservative.

2. Pasteurization: Pasteurized beers have been heated to kill off any remaining or bacteria, extending their shelf life. These beers can stay fresh for around 3 to 6 months in a kegerator. Many commercially available beers are pasteurized, ensuring a longer lifespan for the product. However, it is important to note that even pasteurized beers will eventually degrade in quality over time.

3. Non-Pasteurized Beers: Beers that have not been pasteurized, such as many craft beers or certain traditional styles, have a shorter lifespan in a kegerator. These beers typically have more flavor complexity and can be more delicate in terms of stability. Non-pasteurized beers can last anywhere from 1 to 2 months in a kegerator before their flavors start to deteriorate. It is crucial to consume these beers relatively quickly to fully enjoy their intended taste profile.

4. Temperature Control: The temperature at which a kegerator is set plays a significant role in the freshness and longevity of beer. Ideally, a kegerator should be set to a temperature range between 38 to 45 degrees Fahrenheit (3 to 7 degrees Celsius). This temperature range helps slow down the aging process of the beer and maintains its freshness for a longer period. It is essential to avoid drastic temperature fluctuations, as they can negatively impact the flavor and quality of the beer.

5. Type of Pump: The type of pump used in the kegerator can also affect how long the beer stays fresh. There are two common types of pumps: air-cooled and forced-air cooled. Air-cooled systems tend to have a higher chance of temperature fluctuations, which can accelerate the degradation of the beer. Forced-air cooled systems provide better temperature stability, helping to maintain the beer's freshness for a more extended period.

Personal Experience: I once had a kegerator set at a slightly higher temperature range than recommended, around 50 degrees Fahrenheit (10 degrees Celsius), due to a malfunctioning thermostat. I noticed that the beer in the kegerator started to lose its freshness and develop off-flavors after just a few weeks. This experience highlighted the importance of temperature control in preserving beer quality.

The freshness of beer in a kegerator can vary depending on the beer style, pasteurization, temperature control, and the type of pump used. While pasteurized beers can last for several months, non-pasteurized beers are best consumed within a month or two. Proper temperature control and a forced-air cooled system can help extend the freshness of beer in a kegerator. Remember to check the expiration dates on pasteurized beers and consume non-pasteurized beers relatively quickly to fully enjoy their flavors.