This article is from the rec.food.drink.beer FAQ, by John Lock with numerous contributions by others.
As the largest contract brewer in the U.S., Boston Brewing Co. uses
several breweries around the country to make the various Sam Adams
beers. This info is accurate as of JAN-95.
AKA Jamaica Plain. Former Haffenreffer brewery, a company-owned
facility brewing the Boston Ale and doing R&D work on other
Pittsburgh Brewing Co. brews the largest portion (by volume) of
Sam Adams beers, mostly lagers for eastern distribution.
Lehigh Valley, PA
Stroh Brewery Co. brews the ales for eastern distribution.
Blitz-Weinhard Brewing Co. (owned by G. Heileman). Most Sam
Adams brews for western distribution.
A Gambrinus brewery brews the Boston Lager for the European
The relationship with F.X. Matt of Utica, NY has ended and Sam Adams
beers are no longer made there. There is also a Sam Adams brewpub in
Philadelphia, PA which brews ales from malt extract recipes. Also,
FYI, the Sam Adams Triple Bock was brewed at the Jamaica Plain
facility and then shipped to Bronco Winery in Ceres, CA for aging in