As an experienced sommelier and brewer, I can assure you that beer does not go bad if it freezes. In fact, freezing beer is a common occurrence and does not affect its quality or safety. Unlike some other beverages, such as wine, beer has a high water content which allows it to freeze without significant negative consequences.
When beer freezes, the water content within the beer forms ice crystals. These ice crystals may cause the beer to expand, potentially leading to a broken bottle or can. However, if the beer is stored in a sealed container, such as a can or bottle, the expansion will be contained within the packaging, preventing any damage.
Once the beer thaws, it will return to its original state without any noticeable changes in taste or quality. The only exception to this is if the beer has been exposed to extreme temperature fluctuations during the freezing and thawing process. In such cases, the beer may experience flavor degradation, but this is a rare occurrence.
It's worth noting that while freezing beer is generally safe and does not impact its taste, quality, or safety, it's important to handle frozen beer with caution. If a beer bottle or can has been compromised due to freezing, it's best to discard it to avoid any potential contamination.
In my personal experience, I have stored beer in my basement during the winter months where temperatures can drop below freezing. On occasion, I have discovered that some bottles have frozen solid. However, after allowing them to thaw at room temperature, I have found no discernible difference in taste or quality compared to those that were never frozen.
Freezing beer does not cause it to go bad. The sealed packaging of beer prevents any contamination, and once thawed, the beer will return to its original state. So, if you find yourself with a frozen beer, whether it's in the basement or fridge, rest assured that it will be safe to enjoy once it thaws.