What constitutes an authentic Oktoberfest beer?

Oktoberfest beer, or Oktoberfestbier, is not technically a distinct style of beer. Similar to how sparkling white wine can only be called champagne if produced in the Champagne region, Oktoberfestbier is now a protected geographical designation. Only the beer served at the Munich Oktoberfest can be labeled as Oktoberfestbier, and to be served there, it must be brewed within the city limits.
This restriction means that only six breweries are authorized to produce Oktoberfestbier. If you want to enjoy the authentic version, look for beers from Augustiner-Bräu, Hacker-Pschorr-Bräu, Löwenbräu, Paulaner, Spatenbräu, or Hofbräu-München. In the United States, you will find these genuine Oktoberfestbiers in the imports section. While you may come across similar beers in the domestic selection, they will be labeled as "Oktoberfest Style" and may differ significantly from the original German versions.
Why United States Oktoberfest beer is sometimes different

The beer served at the Munich Oktoberfest varies from year to year. While there are annual changes, two significant trends have emerged over time. In the early 1800s, when Oktoberfest was just beginning, the majority of the beer offered was dunkels, which are dark German lagers. By the mid-1800s, lighter amber märzens began to take precedence. Then, in the 1970s, Paulaner introduced the even lighter festbiers.
Although these shifts have occurred in Munich, the evolution of beers brewed in the United States has not always mirrored this timeline. Currently, festbier is the predominant style in Munich and is specifically labeled as "Oktoberfestbier." In contrast, many craft breweries in the U.S. still lean towards brewing Märzen lagers. Therefore, if you choose an imported Oktoberfest from Munich, you can expect a lighter beer, while an "Oktoberfest Style" beer produced in the U.S. will likely be a heavier, more traditional brew.
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