Made In the San Francisco Bay Area
GigaYeast, Inc.

Irish Stout GY080

Attenuation Medium Gravity*                   82% – 86%

Attenuation High Gravity*                        77% – 80%  (10.1% – 10.7% ABV)

Temperature Range                              64˚F – 72˚F

Flocculation                                             Medium


From one of the most famous stouts in the world.  Creates a crisp, dry beer with a subtle fruity profile and a slightly tangy finish.  Makes an amazing stout or porter but is also great for red, amber and even pale ales.  This ale yeast is a robust fermenter perfect for high gravity brews and settles out well enough to create a relatively clear beer.

Representative Styles:

Stout                                  Porter

Imperial Stout                    Amber/Red Ale

English Pale Ale


* Attenuation was measured after 8 days with Ale yeast at 70˚F and Lager yeast at 50˚F.  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˚ – 72˚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).