Often asked: how cold is too cold? Practical example -- It got colder quicker than I expected, so I had an inbound trade being delivered today. Overnight low was 0, high of 10, and 4 degrees when I got home. Box was sitting by the door, on the ground. Opened it up --- all OK. A couple of the 12oz, lower ABV bottles were beginning to get slushy/frozen in the neck, but all the other showed no sign of freezing and still plenty of room for expansion before busting off the cap. The slushy ones thawed within minutes in the 55 degree basement. I wouldn't recommend this - but if your beer does get caught out in the cold, probably no need for panic.