American Ale Yeast (WY1056)


This yeast is known for extremely clean and crisp fermentation. It allows malt and hop character to dominate. It has mild ester production and can be used to mimic lager fermentations. This strain lacks the genetics for phenol production. It is known for its medium flocculation behavior, and it may require a little extra effort to produce completely clear beers.

This yeast is rummored to originate from the house strain at the Sierra Nevada Brewery. If this is the case, it is probably a closely related strain to White Lab's California Ale Yeast (WLP001). Regardless of origin, these strains have very similar fermentation characteristics and are basically interchangeable.

Beer Styles

This versatile strain could be used in most styles of ale. It also has such low ester production when fermented at low temperatures that it could be used to mimic fermentation with lager yeast. This yeast is a good choice for many American styles: American Pale Ale, American IPA, American Amber Ale, and American Brown Ale. Due to its high alcohol tolerance WLP001 can also be used in higher gravity beers: American Barley Wine, English Old Ale, and Imperial IPA. Its clean and simple flavors work well in beers brewed with unusual ingredients: spice, herb, honey, and smoke flavored beers.

Yeast Characteristics

Yeast Form Liquid
Attenuation 73 - 77 %
Flocculation Medium-Low
Optimum Temp. 60 - 72 °F
Alcohol Tolerance High


  1. Wyeast Laboratories. Retrieved 2013-08-29.