Liquid Yeast YF‑303 Yeastoberfest 100 mL

YF‑303 Yeastoberfest is a traditional German liquid yeast, ideal for rich, malty lagers such as Oktoberfest, Märzen, or Helles. It produces a more pronounced malty profile than Czech strains while maintaining a clean and consistent fermentation at low temperature. At higher temperatures, it may generate elevated levels of sulfites; therefore, brewing between 7 and 14 °C is recommended to achieve a balanced and clear beer. Its consistency and smooth mouthfeel make it a benchmark for authentic German lager enthusiasts.

Why choose this product?

• Rich and rounded malty profile for traditional German lagers.
• Clean and stable fermentation at low temperature.
• Ready‑to‑use format for home brews of 20–25 L (gravity ≤ 1.055).

Technical characteristics

• Strain: Saccharomyces pastorianus
• Fermentation type: Lager
• Origin: German
• Attenuation: 65–73 %
• Flocculation: Low to medium
• Optimal temperature: 7–14 °C
• ABV tolerance: up to 9 %
• Recommended styles: German Lager, Helles, Märzen, Oktoberfest
• Format: 100 mL
• Content: > 100 billion viable cells
• Equivalent: 1 packet of dry yeast 11 g
• Suitable for: 20–25 L brews (gravity ≤ 1.055)
• Storage: 2–5 °C, up to 4 months
• Nutrients or starters not included

Rolling Beers Tips

• Maintain fermentation between 8 and 12 °C for a clean and balanced beer.
• Properly oxygenate the wort before pitching for vigorous fermentation.
• Shake the vial before use to homogenize the yeast.

Product FAQ

• Is it suitable for German lagers? Yes, it is specifically developed for Helles, Märzen, and Oktoberfest styles.
• Should I prepare a starter? Not for standard brews, but recommended for strong beers (> 1.065).
• Can it be stored for several months? Yes, up to 4 months at 2–5 °C in its sealed package.