Germany

Bavarian lager brewing

Cold fermentation and extended cold storage, developed in Bavarian cellars long before refrigeration and later exported worldwide.

Medieval origins; codified in the sixteenth century; industrialised from the 1870s.

Defining practices

What brewers in this tradition actually do differently. These are technical commitments, not preferences.

Fermentation with bottom-cropping yeast at low temperature, suppressing the esters and phenols that warm fermentation produces.
Extended cold conditioning — lagering — for weeks or months, which drops yeast and protein, smooths sulphur and produces exceptional clarity and stability.
Decoction mashing, in which part of the mash is removed, boiled and returned, developing melanoidin depth and aiding conversion of undermodified malt.
Ingredient restraint imposed by law, which pushed flavour development into process rather than additions.

Guilds, legislation, licensing and tax shape what brewers can make at least as much as taste does.

The 1516 Bavarian decree restricted beer to water, barley and hops — yeast was not yet understood — and a summer brewing ban formalised the cold-season, cold-cellar practice that made lagering possible.
The modern German Provisional Beer Law succeeded it and is materially different, permitting yeast and allowing other malted grains for top-fermented beer.

Germany — The centre of lager brewing and of regional style diversity, where centuries of ingredient regulation pushed innovation into process rather than additions.

1100–1500 Hopped beer spreads across northern Europe
Over roughly four centuries hopped beer displaced herb-bittered ale across northern Europe, driven as much by tax and trade as by taste.
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.
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.
1883 Hansen isolates a pure yeast culture at Carlsberg
Emil Christian Hansen isolated a single yeast strain at the Carlsberg Laboratory, making reproducible lager fermentation possible — and the brewery published the method rather than patenting it.
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.
1987 The European Court rules on the German purity requirements
The Court held that Germany could not use its purity rules to bar beer lawfully produced in other member states from being sold as beer.

German regional speciality brewing — The city-level German traditions — Kölsch, Altbier, Rauchbier, Berliner Weisse — that survived the national spread of pale lager.

See every tradition on the traditions index. Last reviewed 2026-08-15.

What BeerHQ knows about this, and how. Every statement carries the state of the evidence behind it rather than being presented flatly as fact.

Bavarian regulation restricted brewing to the cooler months for centuries, which drove the practice of brewing strong beer in March and storing it in cold cellars through summer — the origin of Märzen and of lagering itself.
Backed by a source
Sources: The Oxford Companion to Beer — print; Beer: The Story of the Pint — print