Our bottles of sour beer are ready for consumption when we release them, however, aging bottles of sour beer can be a fun and exciting experience. Since sour beers are acidic (similar pH to wine) and have very little hops, they have the potential to age well over the years. A lot of our visitors enjoy cellaring sour beers, so we’re often asked, “How long should I cellar my bottle of your sour beer?” It’s a simple and great question, with one simple and one complicated answer.
The first, and simplest of the answers, is that we don’t know how long you should age them. Why don’t we know how long you should cellar your beers? Well, we don’t have many data points with our own bottles. We’ve only had beer in bottles since December of 2013, so we can’t say with 100% confidence that our beer will taste great/better in 1, 2, or 5 years. However, our bottles of sour beer should age well for years to come, if cellared properly (55F and in a dark place), which leads us to our second answer to this question.
The second answer, which is long and a little more complicated, is that we do everything we can to preserve the long term quality of the beer and pass on the cellarmanship of that bottle from us, to you. If you are interested in geeking out over the things we do to ensure our bottles of beer are best suited for cellaring, here are a few of the things we do to maintain the long-term quality of our sour beers...
Bottle Conditioning With Fresh Yeast – When we bottle a sour beer, we will add some fresh yeast and a very specific amount of sugar to the beer prior to packaging. Over the course of 1-3 months, the yeast will consume the sugar and create CO2, which will naturally carbonate each bottle of beer. One of the main benefits of bottle conditioning is that the fresh yeast will also absorb some residual oxygen, which can very damaging to beer flavors. Bottle conditioning with fresh yeast should reduce oxidation in the bottle.
Oxygen Scavenging Bottle Caps – Oxygen, a highly reactive molecule, is very damaging to flavors in beer. Picture oxygen as a wrecking ball, swinging around and demolishing the flavors that the yeast and bacteria have spent so long creating. We do everything we can to prevent oxygen from coming into contact with our beers when they are aging and in the package. It’s impossible to remove 100% of oxygen from beer, but our oxygen scavenging bottle caps will continue to absorb oxygen that is in the head space of the bottle after packaging.
Complete Fermentation Before Bottling – Have you ever opened a bottle of beer, only to find the contents gushing out so fast that when all is said and done, the bottle is half empty and you have a big mess on your ceiling? Lame. Over carbonated beer is most often a result of too much fermentable sugar still in the beer when it is bottled. If a beer is bottled and there are still fermentable sugars available for yeast to consume, then the yeast will ferment those sugars, produce CO2, and carbonate the beer further. In order to prevent over carbonation in our bottles, we take regular density measurements to ensure that the yeast has stopped attenuating the beer before the beer is packaged in bottles.
Very Thick Glass Bottles – It’s possible that a beer can over carbonate so much in a bottle that the pressure breaks the bottle. Not only do you lose all the beer you wanted to drink, but more importantly, this is very dangerous and could hurt someone. While we let our beers fully attenuate and do everything to prevent our beers from even getting close to this dangerous level of carbonation, we also use bottles that can withstand 15 Bar (over 200 psi). We don’t expect to have issues with over carbonation, but if we do that issue, we know we’re using the strongest bottles available.
Amber Glass and Oversized Labels – Light is another thing that can damage the flavors in beer and other foods. Specifically in beer, light will drive a photochemical reaction that converts iso-alpha-acids into 3-methly-2-butene-1-thiol, which has aromas that are reminiscent of a skunk. Not too appealing, right? Fortunately, iso-alpha-acids come from boiled hops, and most of our beers are under 10IBUs, so this shouldn’t be much of a problem with our sours. That being said, we use amber glass bottles and cover them with the largest label we can fit on the bottle to prevent as much light from reaching our beers as possible.
While we dont have a concrete answer as to how long you should cellar our beers, we are taking every step we can think of to ensure long-term qulaity in our beers. We’re currently cellaring bottles of each brand, and we’ll be performing sensory analysis on these bottles for years to come. We’ll update this blog post in 10 years, when we have some concrete data around how our bottles have been aging over the years.
There's probably other reasons, but that's off the top of my head?