WHAT EXACTLY IS A LAGER?
The word lager comes directly from the German word “lager,” which simply means “to store.” That name tells you almost everything you need to know about what makes lager different from other beers.
Unlike ales — which are brewed warm and quickly — lagers are fermented slowly at cold temperatures, typically between 35 and 50 degrees Fahrenheit, and then stored for an extended period of time before they are ready to drink. This cold, slow process is called lagering, and it is what gives lager its characteristic clean, crisp, refreshing flavour.
The yeast used in lager brewing, known as Saccharomyces pastorianus, is a bottom-fermenting yeast, meaning it sinks to the bottom of the fermentation vessel during the brewing process. Ale yeast, by contrast, rises to the top. This seemingly small difference in yeast behaviour produces two entirely different families of beer — and the bottom-fermenting, cold-conditioned lager has, by a very wide margin, won the popularity contest.
LAGER DOMINATES GLOBAL BEER CONSUMPTION
Here is the number that puts everything in perspective: lager accounts for somewhere between 85 and 90 percent of all beer consumed worldwide. Virtually every beer you have ever seen advertised on television — Budweiser, Heineken, Corona, Stella Artois, Carlsberg, Asahi, Tsingtao — is a lager. The beers people drink at stadiums, at barbecues, at beach bars, and out of cans on camping trips are almost universally lagers.
China is the largest beer-consuming country in the world and has held that position for nearly two decades. The Czech Republic leads the world in per-capita beer consumption, at around 140 litres per person per year — and the Czechs are arguably the people most responsible for modern lager as we know it, since the first golden lager was brewed in Bohemia, in what is now the Czech Republic.
LAGER IS SURPRISINGLY YOUNG
If you think of lager as a timeless, ancient beverage, you might be surprised to learn that it is, by the standards of human history, relatively new. Brewing itself is ancient — evidence of beer production dates back approximately 6,000 years to the Sumerians of Mesopotamia, who referred to beer as the “divine drink.” But those ancient beers were ales, not lagers.
The cold-fermented lager style only emerged in Central Europe around six centuries ago, and the golden pale lager that most people picture when they think of beer — that clean, clear, fizzy drink in a tall glass — was not developed until the 19th century, when the first golden lager was brewed in the Bohemian city of Pilsen in 1842. That beer became the Pilsner, which is now one of the most widely produced lager styles in the world.
For centuries before refrigeration existed, brewing lager was strictly a winter activity. Brewers would use ice from nearby rivers and lakes to keep their cellars cold enough to ferment and store lager through the warmer months. In some parts of Germany, summer brewing was actually banned by law because warm temperatures made lager production unreliable and often produced spoiled beer.
REFRIGERATION CHANGED EVERYTHING
The story of how lager took over the world is, in large part, the story of refrigeration. Until the 19th century, lager could only be reliably brewed in cool climates during cold months. That changed in 1870, when engineer Carl von Linde developed the first large-scale refrigerated lagering tanks for the Spaten Brewery in Munich. Suddenly, brewers could produce lager year-round, in any climate, anywhere in the world.
Refrigerated railway cars soon followed, allowing lager to be transported across continents without spoiling. The combination of industrial refrigeration and mass production methods meant that lager could be brewed at scale, stored reliably, and shipped globally. The timing coincided with massive waves of German immigration to the United States in the 19th century, where German brewers brought their lager traditions with them. American lager beer took off spectacularly — from 1840 to 1893, per capita beer consumption in the United States increased more than tenfold as lager displaced spirits as the country’s favourite drink.
LAGER COMES IN MORE VARIETIES THAN YOU MIGHT THINK
Most people think of lager as a single style — that pale, golden, fizzy beer. But lager is actually a broad family of styles, and they vary considerably in colour, flavour, strength, and character. Some of the most notable varieties include:
Pilsner — The most widely produced lager style in the world, originating in Bohemia. Pale golden in colour, with a noticeable hop bitterness. The original was brewed in Pilsen in 1842 and gave the world the template for modern lager.
Helles — A softer, maltier, less bitter pale lager from Bavaria. Where a Pilsner is crisp and hoppy, a Helles is rounder and gentler. It is the lager of choice in Munich.
Märzen / Oktoberfest — An amber lager with a richer malt character, traditionally brewed in March and consumed at Oktoberfest in autumn. Stronger and more flavourful than a standard pale lager.
Bock — A stronger, malt-forward lager originating in northern Germany. Darker and more robust, with notes of caramel and toast.
Schwarzbier — A dark lager, literally “black beer” in German. Despite its deep colour it is usually surprisingly light in body, with roasted malt flavours without the heaviness of a stout.
Dunkel — Another dark Bavarian lager, slightly lighter than a Schwarzbier, with smooth chocolate and biscuit malt notes.
THE BEER GARDEN WAS BORN FROM LAGER
Here is a historical footnote that most people don’t know. The beloved tradition of the outdoor beer garden — those large, convivial spaces where people sit at long tables, drink beer in the open air, and generally have a good time — was directly born out of the practical requirements of lager production.
In 19th century Bavaria, brewers needed to keep their underground lagering cellars cool during summer. To protect the cellars from summer heat, they planted chestnut trees above them. Chestnut trees have wide, spreading canopies that provide excellent shade, and crucially, shallow root systems that would not damage the underground cellars below. Brewers began serving beer directly at these shaded sites. The practice evolved, expanded, and eventually became the modern beer garden — a cultural institution that has since spread across the world.
Next time you sit in a beer garden on a warm afternoon, you are participating in a tradition born from the practical necessities of keeping lager cold in a pre-refrigeration age.
LAGER IS HAVING A CRAFT MOMENT
For much of the 1990s and 2000s, the craft beer movement was largely focused on ales — IPAs, stouts, porters, and wheat beers. Lager was seen by craft brewers as the territory of mass-market, industrial brewing, and the major global lager brands were often dismissed by beer enthusiasts as bland and interchangeable.
That perception has shifted considerably in recent years. Craft brewers have returned to lager in a serious way, revisiting traditional European styles — Czech Pilsners, Bavarian Helles, Vienna lagers — and applying the same attention to quality ingredients and brewing technique that transformed craft ales. Light lagers have been gaining market share steadily, with consumer preferences shifting away from intensely bitter or high-alcohol beers toward something cleaner and more refreshing.
The result is that lager, which never really went away, is now being brewed with greater craft and variety than at any point in recent memory. The world’s most popular beer is also, quietly, becoming one of the most interesting.
ONE LAST THING
The next time someone hands you a cold lager and you drink it without thinking much about it, consider that you are participating in a tradition that stretches back six centuries, was reshaped by the invention of the refrigerator, helped by German immigrants transform an entire continent’s drinking habits, and gave the world the beer garden.
Not bad for something that just tastes like a cold beer.
