Jolly Pumpkin Artisan Ales is a brewery in Dexter, Michigan founded by Ron and Laurie Jeffries in 2004.

The wood contains naturally occurring microbiological cultures including brettanomyces.

These cultures impart a flavor profile in the beers described as leathery, earthy, wild and funky.

The Jolly Pumpkin beer is aged anywhere from 4 weeks up to 2 years or more.

[2] Their Oro de Calabaza won the 2004 Gold and the 2005 Bronze Medal in the Belgian- and French-style ale category at the Great American Beer Festival.