Beer — Lager Bavaria · Germany · Reinheitsgebot · BJCP 6B High Confidence

Märzen

Oktoberfest Beer — brewed in March, stored through summer, served in autumn. The amber lager that defined Munich's greatest festival. A style now caught between tradition and commercial transformation.

✓ Verified against BJCP 2021 Category 6B · German Biersteuergesetz (Vorläufiges Biergesetz 1993) · Reinheitsgebot · Munich Oktoberfest regulations · Last verified May 2026

BJCP 2021 Definition — Category 6B: Märzen

Märzen: An amber, malty German lager with a clean, rich malt flavour and a dry finish. Colour 8–17 SRM (amber to deep amber-orange). OG 1.054–1.060. ABV 5.6–6.3%. IBU 18–24 (restrained). Lagered extensively. Rich, bready, Vienna malt character. Low hop bitterness, noble hops only. The defining historic examples are produced by Munich's six Oktoberfest tent-licensed breweries: Hofbräu, Spaten, Augustiner, Paulaner, Löwenbräu, Hacker-Pschorr.

— BJCP 2021, Category 6B; German Vorläufiges Biergesetz (Biersteuergesetz) 1993; Reinheitsgebot provisions; Munich City Council (Stadtrat München) Oktoberfest regulations

What is Märzen?

Märzen (from März — March in German) is an amber German lager that was traditionally brewed in March, stored in cold cellars or mountain ice caves through the summer months when brewing was impossible, and served in autumn — originally at the end of September and into October when the stored beer was ready to drink. This autumn release of the March brew is the origin of Oktoberfest, and Märzen is the traditional Oktoberfest beer.

Märzen is amber to deep copper in colour, malt-forward, with a rich bready character from Vienna malt, low to moderate hop bitterness, and a clean, dry finish from extended cold lagering. At 5.6–6.3% ABV, it is stronger than everyday lager — the stored strength was both a preservation measure and a mark of the occasion.

The Märzen paradox — the authentic style is disappearing from Oktoberfest

In an irony of beer history, the beer served at Munich's Oktoberfest has largely ceased to be Märzen in the traditional sense. In the 1950s and 1960s, the six licensed Munich breweries gradually shifted their Oktoberfest beers from the traditional amber Märzen to a paler, lighter, easier-drinking golden lager style — now sometimes called "Wiesn" or "Festbier." This paler style is what most visitors to Oktoberfest today receive in the iconic 1-litre Masskrug. Authentic amber Märzen still exists and is still produced by the Munich breweries and many craft brewers, but it is no longer the default Oktoberfest serving. Traditional amber Märzen enthusiasts consider this a significant loss.

What does it taste like?

Traditional amber Märzen has a rich, toasted bread aroma and flavour from Vienna malt — a lightly kilned malt that produces a reddish-amber colour and characteristic bready sweetness. The hops (German noble varieties — Hallertau, Spalt, Tettnang) are restrained, providing balance rather than bitterness. The palate has a soft, malt-forward fullness with a clean, dry finish from extended lagering. No diacetyl, no fruity ale esters — clean lager character throughout.

A key characteristic: despite its richness, Märzen is not heavy. The extended lagering removes rough edges and produces a drinkable, smooth beer that goes down easily in quantity — which is exactly what the Oktoberfest tent setting demands.

History — Origin and Gabriel Sedlmayr

The tradition of March brewing predates the modern Märzen style by centuries. Bavarian brewing law historically prohibited summer brewing (typically between St. George's Day, 23 April, and Michaelmas, 29 September) because warm summer temperatures caused uncontrolled fermentation and spoilage. Brewers therefore brewed their last batch in March, made it stronger than usual for storage stability, and stored it in cellars packed with ice from the nearby Alps or in deep mountain tunnels through the summer.

The modern, refined Märzen style was defined in 1841 by Gabriel Sedlmayr II of Spaten Brewery (Spaten-Franziskaner-Bräu) in Munich. Sedlmayr had spent time at major European breweries — including Allsopp's brewery in England (where he studied pale malt technology) and Anton Dreher's brewery in Vienna (where he studied Vienna malt and Vienna lager technique). He combined Vienna malt amber lager technology with Bavarian cold-fermenting lager yeast and cold lagering, producing the refined amber lager that became the Oktoberfest beer standard.

The connection between Märzen and Oktoberfest predates Sedlmayr — the festival itself began in 1810 as a celebration of the marriage of Crown Prince Ludwig (later King Ludwig I) and Princess Therese of Saxony-Hildburghausen. Beer was served from the beginning, but it was the 19th-century evolution of the Märzen style that made the pairing iconic.

Munich Oktoberfest — Regulations

The Munich Oktoberfest is one of the most tightly regulated food and beverage events in Germany. Key facts and rules:

Only beer brewed within the city limits of Munich may be served at Oktoberfest — a regulation set by the Munich City Council (Stadtrat München).
Currently, six Munich breweries hold the licences to operate tents at Oktoberfest: Hofbräu, Spaten (Spaten-Franziskaner-Bräu), Augustiner-Bräu, Paulaner, Löwenbräu, and Hacker-Pschorr.
The minimum alcohol content for Oktoberfest beer (whether amber Märzen or the pale Festbier) is set by the Munich Stadtrat at minimum 5.8% ABV.
Oktoberfest is held annually in late September to early October on the Theresienwiese ("Theresa's Meadow") in Munich — named after Princess Therese, whose 1810 wedding gave the festival its origin.

Landeshauptstadt München (Munich City Council — Stadtrat) — Marienplatz 8, 80331 München · muenchen.de · +49 89 233-0. Issues Oktoberfest brewing licences and sets brewing quality requirements for the event.

Style Parameters and Reinheitsgebot

Märzen — Key Parameters (BJCP 2021 Cat. 6B)
Parameter	Märzen (Traditional)	Festbier (Modern Oktoberfest)
Colour (SRM)	8–17 (amber to deep copper)	4–7 (pale gold)
ABV	5.6–6.3%	5.8–6.3%
IBU	18–24	18–25
Malt character	Rich Vienna malt — bready, toasted, amber	Lighter Munich malt — clean, slightly malty
BJCP category	6B — Märzen	4B — Festbier (separate BJCP category)
OG	1.054–1.060	1.054–1.057
Status at Oktoberfest	Historic style; still available but no longer dominant	Now predominant at Munich Oktoberfest tents

Regulatory Framework — Reinheitsgebot and Biersteuergesetz

Märzen, like all German beer, is governed by the Reinheitsgebot provisions incorporated into the Vorläufiges Biergesetz (German Provisional Beer Law) of 1993. The Reinheitsgebot restricts German beer ingredients to barley malt, hops, water, and yeast (with wheat permitted in wheat beers). No adjuncts, no sugar, no flavourings. Märzen must therefore be brewed only from malted barley, noble hops, water, and lager yeast.

Bayerisches Staatsministerium für Ernährung, Landwirtschaft und Forsten — Ludwigstraße 2, 80539 München, Germany · stmelf.bayern.de. The Bavarian state ministry administering Reinheitsgebot provisions for beer in Bavaria.

Spaten-Franziskaner-Bräu GmbH (the brewery where modern Märzen was defined in 1841) — Marsstraße 46–48, 80335 München, Germany · spatenbraeu.de. Part of AB InBev since 2004. The historic Spaten brewery in Munich maintains records of Sedlmayr's 1841 Märzen development.

BJCP (Beer Judge Certification Program) — bjcp.org. Category 6B (Märzen) and 4B (Festbier) are the BJCP classifications. These are the industry-standard style references for competition and education purposes.

Vienna Malt Chemistry

Märzen's defining colour and flavour derive from Vienna malt — a lightly kilned malt (kilned to approximately 5–6 EBC / 3–3.5°L, compared to pale malt at 3–4 EBC) that produces a reddish-amber colour and characteristic bready, slightly toasted aromatic profile.

The kilning of Vienna malt to slightly higher temperatures than pale malt activates further Maillard reactions at the grain surface, producing melanoidins and Strecker aldehydes that contribute the bready, cracker-like character. The colour compounds produced — primarily melanoidins and carotenoid-Maillard adducts — absorb blue-green light, reflecting the amber-red wavelengths that give Märzen its characteristic colour.

Munich malt (used in darker Bavarian lagers and as a minor component in Märzen) is kilned to approximately 15–20 EBC / 10–12°L — darker than Vienna, producing deeper amber colours and more pronounced toast, bread crust, and light caramel character.

Primary Sources

BJCP 2021 Beer Style Guidelines, Category 6B (Märzen) and 4B (Festbier). bjcp.org.

Vorläufiges Biergesetz (German Provisional Beer Law), 1993 (incorporating Reinheitsgebot). Bayerisches Staatsministerium für Ernährung, Landwirtschaft und Forsten, Ludwigstraße 2, 80539 München. stmelf.bayern.de.

Landeshauptstadt München (Munich City Council). Marienplatz 8, 80331 München. muenchen.de. +49 89 233-0. Oktoberfest regulations including Munich-only brewing requirement and minimum ABV rules.

Spaten-Franziskaner-Bräu GmbH. Marsstraße 46–48, 80335 München. spatenbraeu.de. Historical records of Gabriel Sedlmayr II's 1841 Märzen development at Spaten Brewery.

Narziss, L. and Back, W. (2012). Die Bierbrauerei, Band 2. Wiley-VCH. Vienna malt kilning chemistry, melanoidin formation, and amber lager technical parameters.

This page documents historical and technical sources about Märzen and Oktoberfest beer. See full disclaimer.