WHAT IS CASK ALE?
Cask ale, also known as cask-conditioned beer or real ale, is beer that completes its conditioning naturally inside the cask from which it is served. Unlike most modern draught beer, cask ale continues to develop after leaving the brewery, with live yeast and a small amount of fermentation remaining in the cask. This natural conditioning creates its gentle carbonation and allows the beer’s flavour and character to continue developing before it is poured. Before serving, the cask is allowed to settle and is vented to release excess gas. The result is fresh, naturally carbonated beer served directly from the cask.
CASK VS. DRAUGHT BEER
Cask-conditioned ale is traditionally unfiltered, unpasteurized and naturally carbonated. Unlike most kegged draught beer, which is dispensed using external gas pressure, cask ale develops its carbonation naturally through fermentation inside the cask.
It is traditionally served at cellar temperature—approximately 10–14°C—with a softer level of carbonation than most draught beer. This allows the beer’s aroma, flavour and texture to express themselves differently than they would when served colder and at higher carbonation.
Part of what makes cask ale unique is that the final stages of the beer’s development happen where it is served, requiring care from both the brewer and the people preparing and serving the cask.
DRINK ASAP
Cask ale is a living, perishable beer—and freshness is part of what makes it special. Once a cask is vented and tapped, the beer begins interacting with the surrounding air. From that moment, its flavour and condition gradually change. Traditionally, a tapped cask is best enjoyed fresh, often within just a few days. That short window is part of the inspiration behind Cask Days: gather great cask-conditioned beer, tap it fresh and enjoy it while it is at its best. The golden rule of cask ale: the fresher, the better.
CASK ALE FAQ
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No. Cask ale is traditionally served at cellar temperature—cool, but not ice cold—typically around 11–14°C (52–57°F). At this temperature, the beer maintains its natural condition while allowing its aroma and flavour to be more expressive.
It’s also one of the reasons we host Cask Days in October. Toronto’s cool autumn weather is naturally well suited to serving cask-conditioned beer at the temperature it was intended to be enjoyed.
Cask ale isn’t warm—it’s cellar cool.
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A firkin is a traditional beer cask that holds approximately nine imperial gallons, or about 41 litres of beer. It is one of the most common cask sizes used for cask-conditioned ale.
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Cask ale can be served directly from the cask by gravity—known as a gravity pour—or pulled to the bar using a traditional hand pump, also known as a beer engine. Unlike conventional draught systems, traditional cask service does not rely on external CO₂ pressure to push the beer to the glass.
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Cask ale is best enjoyed fresh. Once a traditionally vented cask is tapped and air begins entering the vessel, the beer gradually changes. How long it remains at its best depends on the beer, its condition, storage and how it is served, but freshness and careful handling are essential parts of the cask ale experience.
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No. Properly conditioned cask ale has a natural, gentle carbonation created by fermentation inside the cask.
It may feel less fizzy than many kegged or packaged beers because it isn't served with the same level of added gas pressure. That softer carbonation is intentional and is part of cask ale's distinctive texture and character.
Cask ale isn't flat—it's naturally conditioned.
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Cask ale needs time to settle and condition before it’s ready to serve. At Cask Days, we position and vent every cask in advance, allowing excess CO₂ to escape and the beer to settle before the festival begins.
Cask ale isn’t necessarily cloudy—some beers pour bright and clear, while others are intentionally hazy. With 100+ casks at Cask Days, each one is prepared and served according to the brewer’s intention.
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Toronto has a long history with cask ale. Outside of Cask Days, you can regularly find cask-conditioned beer at Bar Volo, Birreria Volo, Granite Brewery and C’est What.
Cask availability changes quickly, so drink it when you see it—and join us every October at Cask Days, when we bring together 100+ casks from breweries across Canada.