Made In the San Francisco Bay Area
GigaYeast, Inc.

Kölsch Bier Yeast GY021

Attenuation Medium Gravity*                        79% – 83%

Attenuation High Gravity*                              76% – 79% (9.6% – 10.1% ABV)

Temperature Range:                                   60˚F – 72˚F

Flocculation:                                                  Med/High



From one of the oldest Kölsch breweries in Köln.  Fermenting under 65˚F produces a very clean, crisp beer with a touch of ester.  Perfect for Kölsch or any style where a dry, clean profile is desired.  GY021 produces a moderate amount of sulfide that will dissipate completely.


Recommended Styles:

Kölsch                   Pale Ale

Alt                         India Pale Ale

Cream Ale             Amber


*  Medium Gravity is 14˚ – 16˚Plato.  High Gravity is 23˚- 25˚Plato. 

  The working temperature range represents the range at which fermentation for a given strain produces a typical attenuation- not necessarily the ideal temperature for your particular beer style.  As a rule of thumb, start ale yeast fermentation at 68˚ – 70˚F and then lower or raise temp as desired.  Lager Yeast are typically fermented at 45˚ – 58˚F.  If desired, Lager Yeast can be given a “hot start” at 65-68˚F and then lowered to the primary temperature after active fermentation begins (10-20hrs). 

GigaYeast laboratory is still gathering data on many of our strains.  Information provided here may change some in the future.  Please call if you need more info.