Beer Galaxy
Imperial Stout — The Guide to the Powerful Black Beer
The Imperial Stout — often shortened to “IS” or “RIS” for Russian Imperial Stout — is the most powerful expression of the Stout family. Born in 18th-century London to survive the long sea voyage to Saint Petersburg, it was massively hopped and heavily alcoholic to avoid freezing and spoiling along the way. Particularly loved by the court of Catherine the Great of Russia (hence “Russian Imperial”), it nearly disappeared in the 20th century before being revived by the American craft revolution. Today, Imperial Stout has become the most collected craft style in the world, with bourbon-barrel-aged versions (BCBS), dessert-inspired “Pastry Stouts”, and rare bottles fetching premium prices on the secondary market.
Style characteristics
| Abv | 8% – 15% (sometimes more in BCBS) |
|---|---|
| Ibu | 50 – 90 |
| Ebc | 80 – 200+ (ink black) |
| Appearance | Completely opaque black, dense tan-brown head |
| Fermentation | Top (ale), often followed by long ageing |
| Serving_temperature | 12 – 14 °C (cellar temperature, never iced) |
| Glass | Snifter or footed tulip |
| Aromas | Dark chocolate, espresso, dried fruit, vanilla, bourbon, molasses, liquorice |
| Shelf_life | Excellent — can cellar for 5–10 years, gaining complexity |
Sub-styles
- Classic Russian Imperial Stout (RIS) The canonical style: intense, complex, 9–12% ABV. References: Nogene Ø Imperial Stout, Founders Imperial Stout, North Coast Old Rasputin.
- Bourbon Barrel-Aged Stout (BBA / BCBS) Imperial Stout aged in used bourbon barrels, adding vanilla, oak, caramel and bourbon. The pinnacle of the style: Goose Island Bourbon County, Founders KBS, Founders Breakfast Stout.
- Pastry Stout A modern trend (since 2015): Imperial Stout with dessert-style additions — chocolate, vanilla, coconut, marshmallow, pecan pie. Often very sweet. Reference: Omnipollo Noa Pecan Mud Cake.
- Coffee / Breakfast Imperial Stout Imperial Stout infused with high-quality coffee, amplifying the natural roasted profile.
- Baltic Porter (close cousin) A Baltic-tradition variant of Imperial Stout, sometimes brewed with bottom fermentation (lager) instead of top.
- Japanese Imperial Stout A modern revival from breweries like Echigo, applying Japanese precision to the style.
All Imperial Stouts in our catalogue
7 beers in this family
Frequently Asked Questions
What is an Imperial Stout?
An Imperial Stout is a powerful version of the Stout, typically 8 to 12% ABV (sometimes more). Born in 18th-century London for the Russian market, it is defined by maximum intensity on the palate: massive roasted malts, present alcohol, and an aroma profile of chocolate, coffee, dried fruit and sometimes barrel ageing.
Why “Russian” Imperial Stout?
The adjective comes from the 18th-century Russian imperial court, which adored these strong beers imported from England. To survive the frozen Baltic, London brewers raised both alcohol and hops. Empress Catherine the Great was a great enthusiast — hence the nickname “Russian Imperial Stout”.
What is a Bourbon Barrel-Aged Stout (BCBS)?
It is an Imperial Stout aged for several months (often 6 to 24 months) in used bourbon barrels. The wood imparts vanilla, caramel, oak and residual bourbon aromas to the beer. Today it represents the peak of the craft style. Goose Island Bourbon County Brand Stout (BCBS), released every Black Friday since 1992, is its icon.
How long can an Imperial Stout be cellared?
It is one of the few beer styles that improves with age. A quality Imperial Stout can be cellared for 5 to 10 years (12–14 °C, horizontal, away from light), gaining complexity (bitterness rounds, leather and dried-fruit notes emerge). BCBS in particular benefit greatly from ageing.
How should I serve an Imperial Stout?
Never iced — at 12–14 °C (cellar temperature). In a snifter or footed tulip glass to concentrate the aromas. Pour small portions (15–20 cl) to appreciate the complexity without saturating the palate. Ideally at the end of a meal, in place of a digestif.
Which Imperial Stouts should I try to discover the style?
To start: North Coast Old Rasputin (USA, approachable, classic), Founders Imperial Stout. For BBA: Founders KBS (Kentucky Breakfast Stout), Goose Island Bourbon County Stout. For Pastry: Omnipollo Noa Pecan Mud Cake. For Nordic character: Nøgne Ø Imperial Stout. For Japanese: Echigo Imperial Stout.