2565 Kölsch
Liquid Ale yeast from Wyeast.
Lab
Wyeast· Ale · Liquid · 2565
Wyeast· Ale · Liquid · 2565Specs
Attenuation
73–77%
The share of sugars the yeast ferments out. Higher attenuation means a drier, stronger beer.
Optimal temp
13–21°C
55–70°F
The range where this strain ferments cleanly, without throwing off-flavors. Most brewers pitch near the low end.
Flocculation
Low
How readily the yeast clumps together and drops clear once fermentation winds down.
Alcohol tolerance
≈10% ABV
The rough ABV ceiling where the yeast stresses out and stops fermenting.
Genetic traits
Phenolics
POF−
Ferments clean
Phenolically clean (POF-negative). No clove or spice, so malt, esters, and hops come through unmasked. The norm for American and British ales and most lagers.
Diastatic
STA-1−
Not diastatic
Does not carry the STA1 (diastaticus) gene. It attenuates normally, with no diastaticus over-attenuation or gushing risk.
Same strain, other labs
Usually used in
KolschWheatCream AleBerliner WeisseFruit Beer & Amber Lager
Common questions
- What is the 2565 Kölsch equivalent?
- OYL-017 Kolsch I — the same strain from another lab, the Kölsch (2565) strain.
- What is 2565 Kölsch's attenuation?
- 73–77% apparent attenuation.
- What temperature should I ferment 2565 Kölsch at?
- 13–21°C is the recommended range.
- Does 2565 Kölsch produce phenolics (clove and spice)?
- No. 2565 Kölsch is POF-negative (phenolically clean), so it won't throw clove or spice.
- What beer styles is 2565 Kölsch good for?
- Kolsch, Wheat, Cream Ale, Berliner Weisse, and Fruit Beer & Amber Lager.
Brew with 2565 Kölsch
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