Butternuts Beer and Ale's Pork Slap pale ale is a favorite of hipsters throughout the Northeast. Flickr/Garden State Hiker The recent explosion of American microbreweries has shifted the beer industry's attention to quality, not quantity. And now — with Oktoberfest underway — is the perfect time to discover a new artisanal brew.

We found the 24 coolest microbrewers making waves in the American craft beer industry, from a Latin American-style cervecería in Chicago to a sustainable brewery in Maui that uses local Hawaiian ingredients to make its brews.

A brewery is considered a microbrewery if it produces less than 15,000 barrels per year, with 75% or more of its beer sold off-site, according to the Brewers Association.