Beer through time · era 4 of 9
Lager and the conquest of cold
Lager was a beer you could only make in cold places at cold times of year, until it was not — and the technology that removed the constraint is why most of the world now drinks it.
BeerHQ’s own bracket for a change that happened gradually and has no start date.
Going in
Cold fermentation confined to territories with hard winters and rock to dig into, and to roughly half the year.
Coming out
Pale lager brewable anywhere on earth, at any season, at any scale — and displacing local traditions almost everywhere it arrived.
Lager is named after storage, and that is the whole story
Bavarian brewers had been fermenting cold and storing beer through the summer in rock cellars for centuries before anything pale existed. *Lagern* means to store; the beer is named after what had to be done to it. Ice was cut from lakes in winter and packed into cellars, and the cellars themselves were cut where the geology allowed.
A Bavarian ordinance from 1553 forbade brewing between spring and autumn. That is often told as quaint regulation and is better read as an admission: warm-weather brewing produced bad and sometimes dangerous beer, and the law codified what brewers already knew. It is also the origin of Märzen — beer brewed in March, at the last legal moment, and stored to last the summer.
What these beers were not was pale. Malt kilned over fire produced dark or amber beer, and no Bavarian brewer of 1700 could have made a golden lager whatever they wanted.
Plzeň, 1842
The town’s burghers had brewing rights and, by the 1830s, beer bad enough to be dumped in the street in protest. Their response was institutional: build a new common brewery and hire a Bavarian brewer, Josef Groll, who brought cold-fermentation technique.
What Plzeň supplied was the rest. Exceptionally soft water, which lets a large Saaz hopping rate read as floral rather than harsh. Pale malt, made possible by English indirect kilning. The combination produced a beer that was golden and brilliantly clear, and nothing had looked like it before.
The reception depended on something outside brewing entirely: cheap glass drinking vessels were reaching ordinary pubs in the same decades. In a pewter pot this would have been a good lager. In a glass it was a category, and within fifty years everybody was trying to make one.
Refrigeration removed the geography
Even after 1842, lager remained a beer of cold places and cold seasons. Carl von Linde’s mechanical refrigeration, developed from the 1870s working directly with Bavarian brewers, turned cold into a utility that could be bought anywhere.
The consequences are the largest of any single technology in brewing. Lager could be made in Madrid, Mexico City, Sydney or Shanghai, year-round, at industrial scale. Combined with pure yeast culture — which made long cold fermentations safe — and with pasteurisation and rail, it produced a beer that could be made anywhere and sold everywhere. That is why most beer brewed today is pale lager, and the reason is closer to engineering than to taste.
What changed the beer
- Mechanical refrigeration
The single technology most responsible for what the world drinks now: it detached cold fermentation from winter, from caves, and from Bavaria.
- Indirect kilning and pale malt
Drying malt with heat that never touches it — first over coke, later over hot air — which made genuinely pale malt possible and turned beer colour into a choice.
What people get wrong about this period
- Was lager invented in 1842?
Cold bottom-fermented brewing is centuries older than 1842. What was new at Plzeň was a lager that was pale and clear, which is a combination rather than an invention.
- Has the Reinheitsgebot protected German beer unchanged since 1516?
A real 1516 Bavarian ordinance, listing three ingredients, concerned with bread grain and prices, replaced repeatedly since. The modern rules are twentieth-century law.
Dated events in this period
1516 The Bavarian purity ordinance
A Bavarian ordinance restricting beer to barley, hops and water, fixing prices and reserving wheat and rye for bread.
1553 Bavaria restricts brewing to the cooler months
Regulation confining brewing to the period between autumn and spring, which produced both Märzen and the practice of lagering.
1842 The first pale bottom-fermented beer is brewed in Plzeň
A Bavarian brewer, exceptionally soft local water, pale kilned Moravian malt and Saaz hops produced a beer that reshaped world brewing within a generation.
1860–1900 Vienna lager survives in Mexico
Central European brewers emigrating to Mexico carried the Vienna amber lager tradition with them, and it persisted there after largely disappearing in Austria.
1873 Mechanical refrigeration reaches the brewery
Carl von Linde’s ammonia refrigeration, first installed in a brewery in the early 1870s, freed lager production from cold cellars and natural ice.
1894 Munich answers Bohemian pale lager with Helles
Munich brewers, losing ground to pale Bohemian beer, produced a pale lager of their own — maltier and less bitter than the beer it responded to.
People
- Josef Groll
Brewed the first pale lager at Plzeň in 1842 — a combination of Bavarian technique, English malting and Bohemian water, rather than an invention.
- Carl von Linde
Built the refrigeration that brewing adopted, which detached lager from cold cellars and cold winters and let it be brewed anywhere.
Styles shaped here
- Czech premium pale lager
The original pale lager: rich bready malt, generous Saaz hopping and a rounded bitterness that soft Bohemian water makes possible.
- Munich Helles
Bavaria’s everyday pale lager: soft, bready and malt-forward, with just enough hop to balance and nothing to distract.
- German Pils
Pale, dry and firmly bitter, with a crisp finish and a spicy-floral noble hop character — Germany’s answer to the Bohemian original.
- Märzen
A rich amber lager brewed in March for autumn drinking, with deep toasty malt and a clean, firm finish.
- Vienna lager
An amber lager built on gently kilned Vienna malt: toasty and lightly sweet, but finishing clean and dry.
Questions
When was pilsner invented?
The first pale bottom-fermented beer was brewed in Plzeň in 1842 by Josef Groll. What was new was the combination — Bavarian cold-fermentation technique, English-style pale malt, exceptionally soft Bohemian water and Saaz hops — rather than lager itself, which is centuries older and is named after the cold storage it depends on.
Places and traditions
What changed next
Before this: Industrial brewing · The whole history of beer
Last reviewed 2026-08-29.