White Labs WLP099 Super High Gravity Ale from White Labs: 18 to 21 C (65 to 69 F), over 80 % attenuation, Very High tolerance, medium flocculation. Styles and substitutes.
Updated 05 September 2026.
White Labs WLP099 Super High Gravity Ale yeast: temperature, attenuation and alcohol tolerance
White Labs (liquid)The published White Labs data for White Labs WLP099 Super High Gravity Ale, the styles it suits, and what to use if you cannot get it.
Published technical data
| Manufacturer | White Labs (liquid) |
|---|---|
| Species | Saccharomyces cerevisiae, top-fermenting ale |
| Fermentation temperature | 18 to 21 C (65 to 69 F) |
| Apparent attenuation | over 80 % |
| Alcohol tolerance | Very High |
| Flocculation | Medium |
Notes
Recommended for barleywine, imperial stout, Belgian strong ale, old ale.
Character: Clean, alcohol-tolerant character for very strong beers.
White Labs' highest-tolerance ale strain, documented to ferment beers up to around 25% ABV under the right regime, which is why it is the pick for barleywines and imperial beers that stall a normal strain. Feed it well and step up the gravity for the biggest beers.
Substitutes and styles
Questions and answers
What is the manufacturer of the White Labs WLP099 Super High Gravity Ale yeast?
White Labs (liquid)
What is the species of the White Labs WLP099 Super High Gravity Ale yeast?
Saccharomyces cerevisiae, top-fermenting ale
What is the fermentation temperature of the White Labs WLP099 Super High Gravity Ale yeast?
18 to 21 C (65 to 69 F)
What is the apparent attenuation of the White Labs WLP099 Super High Gravity Ale yeast?
over 80 %