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Coolship Merus

Unblended Spontaneous Ale

All of our Coolship beers are fermented using solely wild microbiota found in the open air. Only Coolship Merus goes unblended—meaning all of this batch comes from a single barrel, rather than a blend of multiple barrels. This year’s batch aged for two years in an American oak barrel and is layered with complex flavors like lemon, dried fruit, and oak. Enjoy this batch of Coolship Merus, because there will never be one like it again.


Grains: Pilsner Malt, Raw Wheat

Hops: Aged Whole-Leaf Hops

Yeast: Wild Serving Temp: 40-50°F

Ideal Within: Four Years

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Sour Beers

Tartness can be found in a wide variety of beers—and can be added to beers in a wide variety of ways. You’ll find sourness in beer from souring bacteria, from fresh fruit, and sometimes from wild microflora floating in the Maine air. To see the full array of all of our beers that contain a distinct note of tartness in their flavor profile, click that button below.

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What's a Coolship?

Using a centuries-old Belgian brewing tradition, we're able to achieve a complex, and delicious, style of beer with the help of wild yeast floating in the Maine air.

How We Brew Coolship Beer

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Since 2019, we've been a Certified B Corp brewery, striving to brew for the good of our employees, community, and environment.

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The Allagash Team gathering together in 2023.

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From Maine, With Love

an Allagash Brewing Co. Podcast

This fun, informal, and informative podcast shows listeners what it’s like to work at an independent B Corp-certified brewery up here in Portland, Maine.