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A coolship (Anglicized version of the Dutch/Flemish koelschip) is a type of fermentation vessel used in the production of beer. Traditionally, a coolship is a broad, open-top, flat vessel in which wort cools.[1] The high surface-to-mass ratio allows for more efficient cooling.[2] Contemporary usage includes any open fermentor used in the production of beer, even when using modern mechanical cooling techniques. Traditionally, coolships were constructed of wood, but later were lined with iron or copper for better thermal conductivity.

While Anchor Brewing Company is the oldest continually-operated brewery in the United States to employ open fermentation, coolships in the traditional sense[3] were first used in the United States by Allagash Brewing Company.

Several craft breweries have followed, including:

  • Resident Culture Brewing Company, Charlotte, North Carolina
  • Black Project Spontaneous & Wild Ales, Denver, Colorado
  • de Garde Brewing, Tillamook, Oregon
  • Gunbarrel Brewing Company, Boulder, Colorado
  • Jester King, Austin, Texas
  • Logsdon Organic Farmhouse Ales, Hood River, Oregon
  • New Glarus Brewing Company, New Glarus, Wisconsin
  • Russian River Brewing Company, Santa Rosa, California
  • Trillium Brewing Company, Boston, Massachusetts
  • Wild Mind Artisan Ales, Minneapolis, Minnesota
  • Anchorage Brewing Company[4], Anchorage, Alaska
  • Beachwood Blendery, Long Beach, California
  • Blue Jacket, Washington DC
  • Block 15 Brewing, Corvallis, Oregon
  • Brothers Cascadia Brewing, Vancouver, Washington
  • Burley Oak Brewing Company[5], Berlin, Maryland
  • Crooked Stave, Denver, Colorado
  • Draai Laag, Pittsburgh, Pennsylvania
  • Funk Factory Geuzeria, Madison, Wisconsin
  • Kent Falls Brewing Company, Kent, Connecticut
  • LIC Beer Project, Long Island City, New York
  • OEC Brewing, Oxford, Connecticut
  • Oxbow Brewing Company, Newcastle, Maine
  • Peekskill Brewery, Peekskill, New York
  • Pen Druid Brewing[6], Sperryville, Virginia
  • Plan Bee Farm Brewery, Poughkeepsie, New York
  • Reaver Beach Brewing, Virginia Beach, Virginia
  • Rivertown Brewing Company[7], Cincinnati, Ohio
  • Side Project Brewing, Maplewood, Missouri
  • Strange Roots Experimental Ales (formerly Draai Laag) Pittsburgh, Pennsylvania
  • Transient Artisan Ales, Bridgman, Michigan
  • Wander Brewing, Bellingham, Washington
  • Wicked Weed, Asheville, North Carolina
  • Insurrection Ale Works, Heidelberg, PA
  • Phantom Carriage Brewery and Blendery, Carson, CA
  • Monday Night Brewing, Atlanta, GA
  • Counter Weight Brewing Co., Hamden, CT
  • Arizona Wilderness Brewing Co., Gilbert, AZ

On October 12, 2017, Two Roads Brewing Company commenced construction of a second facility which will be dedicated to experimental brewing and will house a coolship.[8]


  1. ^ "Coolship". Retrieved 21 September 2013. 
  2. ^ "Anchor Terminology: Coolship". Anchor Brewing Company. Retrieved 21 September 2013. 
  3. ^ "Coolship Lands at Allagash Brewing Company". Retrieved 21 September 2013. 
  4. ^ Roberts, James. "The coolship is landing". Anchorage Press. Retrieved 25 September 2013. 
  5. ^ "Facebook". Retrieved 2016-04-26. 
  6. ^ "Pen Druid Brewing on Instagram: "Oh hell yeah! Coolship #1"". 
  7. ^ "How does a Beer become Sour? | Rivertown Brewery and Barrel House". Retrieved 2017-10-12. 
  8. ^ Co, Two Roads Brewing. "Two Roads Brewing Co - Stratford, CT". Retrieved 2017-10-13.