GROWLER CARE 101
With proper care, beer can potentially stay fresh in a growler for as much as two weeks (although, who would let that happen?). If not taken care of, beer can begin declining in quality within hours. Follow these suggestions for best results:
Double check your cap is tight. Your server will always attempt a snug cap but nobody’s perfect one hundred percent of the time. Double checking is a quick and easy way to ensure quality in your growler. The tighter the cap, the better it will protect the beer.
Keep growlers out of the sun. UV light from the sun will both warm up the beer and will react with the beer causing it to become “Lightstruck”. This will make the beer smell skunky. Stainless Steel and Ceramic growlers will prevent the issue while brown glass will delay the time it takes. Green and clear glass blocks very little light.
Keep the growler cold. This will ensure that the beer stays carbonated. Growler caps are not capable of fully containing significant amounts of built up pressure from escaping the bottle. As beer warms up, it will release a lot of carbon dioxide which the cap will not be able to prevent. Keeping the beer cold at all times before consumption will ensure the best quality for the longest amount of time.
Consume in a single day. When beer is poured from a growler, oxygen enters in its place. This will lead to oxidation in the leftover beer which causes a stale taste, often “cardboard like”. Depending on the beer style, the beer can also change colour.