American Ale

From a famous West Coast Brewery. A quick fermenting yeast low on esters. Flocculates really well for a clean and crisp ale. Brings out the hops well, good for American style hoppy beers. Comparable to Chico but flocculates harder. A great alternative to JY215.

A yeast rumored to be from one of the biggest hop-driven breweries in California. Very clean, neutral, and fast fermenting. Ester production is low, and the yeast is neutral in flavor and aroma. Alcohol tolerance is high for demanding fermentations. Ideal for higher gravity recipes when you want a drier finish (West Coast Double IPA). Premature spunding/bunging can result in an elevated sulfur production and loss of hop aromatics. Keep the head pressure low.

A yeast from a famous Michigan brewery. Slightly slower fermentation than the rest of the American strains, albeit steady. When fermented within the advised temperature range, a soft and almost creamy yeast character can be found in your beer. A yeast that leans itself greatly for American-Style Wheat, but can also be used for Ambers, Reds, Stouts and other styles.

Capture the spirit of American craft brewing with JY039 Founder, a clean and versatile strain that puts hops and malt in the spotlight. Born from the heart of the U.S. beer revolution, this yeast delivers crisp, balanced beers with just a whisper of fruitiness. 
JY039 traces its roots to one of the pioneering craft breweries of the American East Coast. Its medium attenuation results in a balanced body. Perfect for showcasing hop aromas or rich malts and classic East Coast IPA, JY039 is a brewer’s best friend for American classics.

Sourced from a famous Vermont Brewery, but has evolved stronger flocculation characteristics. Most likely originating from Britain long ago. Works great for hoppy beers such as Pale Ales, IPAs and Double/Imperial IPAs. Fruity when fermented warm, and this fruitiness blends great with hoppiness from the hops you use.

A very reliable and dependable strain, developed by natural selection at Jasper Yeast. Flocculates like a rock when fermentation is complete. Versatile and robust, this strain is perfect for the brewer that does not have time to babysit fermentations, and does not have the capacity to filter or centrifuge.

The classic American Ale yeast. Good attenuation but balanced and smooth, finishing clean.

Sourced from a brewery specializing in hazy NE-style IPAs, this strain is ideal for beers requiring medium-to-lower attenuation to enhance body and a balanced finish. Most likely originating from Britain long ago. Works great for hoppy beers such as Pale Ales, IPAs and Double/Imperial IPAs. Fruity when fermented warm, and this fruitiness blends great with hoppiness from the hops you use.

Similar to our 127, but with higher attenuation, this strain has its ancestry traced to a famous Vermont Brewery. Most likely originating from Britain long ago. Works great for hoppy beers such as NE-style hazy IPAs, IPAs and Double/Imperial IPAs. Fruity when fermented warm, and this fruitiness blends great with hoppiness from the hops you use. Great choice for a hazy IPA requiring higher attenuation. Peachy.

Sourced from a renowned Pacific North-West brewery, JY287 American Wheat is a versatile ale yeast tailored for vibrant, hop-forward American wheat beers. This strain delivers a crisp, slightly tart finish with delicate citrus undertones, steering clear of heavy esters or phenolics. A clean fermentation profile lets malt and hops shine. Perfect for refreshing wheat ales, pale ales, or experimental brews where a milder wheat character is key.

JY293 is an historic American ale strain from Milwaukee. This strain embodies the spirit of Heritage US ale brewing with its clean, crisp fermentation and subtle malt-forward character, making it a versatile workhorse for a wide range of styles. JY293 produces mild fruity esters, complemented by a smooth, balanced finish that lets hops and malt shine. Its reliable performance across moderate temperatures ensures consistent results.

JY302 is a special strain, it is very neutral but has an amazing alcohol tolerance. It can withstand starting gravities over 30°P, and still attenuate till 3.5-4 °P. In regular gravity worts it behaves normal and does not really over-attenuate. Great for big imperial stouts/triple IPAs/Barleywines that you want to finish on the drier side.

JY338 is a versatile American ale yeast, famous for its use in brewpubs in the 90ies and 2000s. This strain is a brewer’s all-purpose tool, ideal for a wide array of styles from hoppy IPAs to robust stouts. JY338 delivers a distinctive, full-bodied mouthfeel that amplifies malt richness, caramel depth, or fruity hop notes without leaving residual sweetness or under-attenuation. Its clean fermentation profile produces subtle esters. With low flocculation, JY338 yields a slightly hazy beer that may require fining or extended cold conditioning for clarity, making it perfect for American Amber Ales, Pale Ales, and malt-forward Porters. The strain can be a slow starter on generation one, but some extra oxygen will do the trick.