A glass of Kölsch in Aachen
|Country of origin||Germany|
|Alcohol by volume||4.4%–5.2%|
|Malt percentage||usually 100%|
Kölsch is warm fermented at around 13 to 21 °C (55 to 70 °F), then conditioned by lagering at cold temperatures. This style of fermentation links Kölsch with some other central northern European beers such as the Altbiers of western Germany and the Netherlands.
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The term Kölsch was first officially used in 1918 to describe the beer that had been brewed by the Sünner brewery since 1906. It was developed from the similar but cloudier variant Wieß (for "white" in the Kölsch dialect). It never became particularly popular in the first half of the twentieth century, when bottom-fermented beers prevailed as in the rest of Germany. Prior to World War II Cologne had more than forty breweries; this number was reduced to two in the devastation and its aftermath.
In 1946, many of the breweries managed to re-establish themselves. In the 1940s and 1950s, Kölsch still could not match the sales of bottom-fermented beer, but in the 1960s it began to rise in popularity in the Cologne beer market. From a production of merely 50 million liters in 1960, Cologne's beer production peaked at 370 million liters in 1980. Recent price increases and changing drinking habits have caused economic hardship for many of the traditional corner bars (Kölschkneipen) and smaller breweries. By 2005 output had declined to 240 million litres.
Thirteen breweries produce Kölsch in and around Cologne, anchored by Früh, Gaffel, Reissdorf and Kölner Verbund. There are also smaller brewers, such as Mühlen-Kölsch or Bischoff-Kölsch. In adherence to the Kölsch Konvention of 1986 Kölsch may not be brewed outside the Cologne region. A few outlying breweries were grandfathered. About ten other breweries in Germany produce beer in Kölsch-style, but are not allowed to call it Kölsch because they are not members of the convention.
In 1997, Kölsch became a product with protected geographical indication (PGI), expanding protection to the entire EU and several countries beyond it. Exports of Kölsch to the United States, Russia, China and Brazil are increasing. Exported Kölsch does not need to strictly comply with the Provisional German Beer Law, the current implementation of the Reinheitsgebot.
|Brewery||Established||Annual output in hectolitres|
|Gaffel Becker & Co||1908||500,000|
|Cölner Hofbräu Früh||1904||440,000|
Wieß (transliterated as Wiess pronounced [ⱱiːs], for "white" in the Kölsch language) is a cloudy, unfiltered version of Kölsch. It had virtually disappeared from the market during most of the 20th century, but has seen a small resurgence in recent[when?] years.
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Kölsch is a product with protected geographical indication (PGI) per EU law. The Kölsch Konvention specifically defines the rules to be followed to allow a beer to carry the name Kölsch, which includes that it must be brewed within a 50 km zone around Cologne, Germany.
- The Jacob Leinenkugel Brewing Company in Chippewa Falls, Wisconsin, produces a rye-flavored Kölsch-style beer, which they promote under the name of "Canoe Paddler" as a seasonal beer.
- Newburyport Brewing Company in Newburyport, Massachusetts produces a Kölsch-style beer, Das Kölsch, containing 5% ABV.
- Long Trail Brewing Company in Bridgewater Corners, Vermont produces a seasonal Kölsch-style beer, which they promote under the name of "Ramble".
- Lexington Brewing and Distilling Company in Lexington, Kentucky produces a Kölsch-style beer, which won gold for Kölsch-style beer at the Brussels Beer Challenge in December 2013.
- Ordnance Brewing Co., out of Boardman, OR, combines a classic German style with a Pacific Northwest personality. Clean and easy but deep and somewhat brooding with a malt backbone. ABV: 5.5% IBU: 16
- Alaskan Brewing Company in Juneau, Alaska, also makes a summer Kölsch-style ale,
- Land-Grant Brewing Co. from Columbus, Ohio has an "American-type" Kölsch-style beer called "1862 Ale" (4.9% ABV).
- Big Boss Brewing Company in Raleigh, North Carolina makes a Kölsch-style ale called "Angry Angel".
- Beau's All Natural Brewing Company in Vankleek Hill, Ontario, produces an organic Kölsch-style lagered ale, "Beau's Lug-Tread"
- Karbach Brewing Company in Houston, Texas produces a 4.9% ABV Kölsch-style beer called "Love Street".
- Eventide Brewind in the Grant Park Neighborhood of Atlanta, Georgia produces a Kölsch-style beer.
- SacTown Union Brewery in Sacramento, CA, produces a Kölsch-style beer.
- Left Handed Giant Brewing Company in Bristol produces a Kölsch-style beer called Kolsssh. 
- The Zeelandt Brewing company in Esk Valley Near Napier produces a Kölsch-style beer called Kolsch 
- Knupp beer (Kölsches Knupp, Kölnisches Knupp, Kuletschbier), another type of beer of Colognian origin
- Beer in Germany
- Ray Daniels, Designing Great Beers (Boulder, Colorado: Brewers Publications, 1996), 127-8 and 136-9.
- Bolsover, Catherine (1 October 2011). "Cologne's favorite beer, Kölsch, makes new friends abroad". Deutsche Welle. Retrieved 1 October 2011.
- "Please Verify Your Age - Long Trail". longtrail.com. Retrieved 12 April 2015.
- "Awarded beers". brusselsbeerchallenge.com. Retrieved 12 April 2015.
- Administrator. "Alaskan Brewing Company - Summer Ale". alaskanbeer.com. Retrieved 12 April 2015.