One Barrel Brewing Co.

One Barrel Brewing Co.

One Barrel Brewing Co.

2001 Atwood Ave, Madison, WI 53704
(608) 630-9286
First Visited: December 23, 2014

Madison’s first “nanobrewery” of the modern craft era was the aptly named One Barrel Brewing Co., which opened in July 2012. Founder and brewer Peter Gentry had a vision of creating small-batch, handcrafted beers that showcased the artistry and creativity of brewing. With a focus on quality, innovation, and community, One Barrel quickly became a beloved institution in Madison’s vibrant craft beer scene.

Peter Gentry’s journey into the world of brewing began with a deep passion for beer and a desire to create unique and flavorful brews. He honed his brewing skills through years of homebrewing, experimenting with different recipes and techniques. Inspired by the growing craft beer movement and the possibility of starting his own brewery, Gentry took the leap and opened One Barrel.

One Barrel distinguished itself from other breweries in Madison by its small-scale production. Instead of aiming for mass distribution, Gentry focused on brewing small batches of beer using a one-barrel system. This allowed him to have complete control over the brewing process, ensuring the highest quality and attention to detail in every batch. The nanobrewery concept also meant that One Barrel Brewing Co. could constantly rotate its beer selection, offering customers a diverse and ever-changing lineup of brews.

From the moment it opened its doors, One Barrel Brewing Co. captured the hearts of Madison beer enthusiasts. The cozy taproom, adorned with wooden accents and brewing equipment, provided an intimate and welcoming space for patrons to enjoy their handcrafted beers. Gentry’s dedication to his craft was evident in every pint, and customers flocked to the brewery to experience the unique flavors and aromas that One Barrel had to offer.

One of the standout aspects of One Barrel was its commitment to experimentation and innovation. Gentry constantly pushed the boundaries of traditional brewing, infusing his beers with unconventional ingredients and flavors. From fruit-infused ales to barrel-aged stouts, each beer was a testament to Gentry’s creativity and willingness to take risks. This approach resonated with Madison’s adventurous beer drinkers, who eagerly awaited each new release to see what One Barrel had in store.

In addition to its innovative beers, One Barrel also fostered a strong sense of community. Gentry and his team made it a priority to engage with their customers, listening to feedback and incorporating their input into the brewing process. The brewery regularly hosted events, such as beer tastings and educational workshops, where beer enthusiasts could deepen their knowledge and appreciation for craft brewing. One Barrel also collaborated with local businesses and organizations, further strengthening its ties to the community.

As the popularity of One Barrel grew, so did the demand for its beers. The nanobrewery model, while allowing for flexibility and creativity, presented challenges in meeting the increasing customer demand. To address this, Gentry turned to Madison’s House of Brews for help brewing before becoming a client of Octopi Brewing in Waunakee for bottle releases.

In May 2019, Peter Gentry, the owner of One Barrel, purchased a 4,000-square-foot building located at 4633 Market St. in Egg Harbor planning to recreate the successful concept of his nanobrewery cozy pub atmosphere from the Atwood neighborhood in this new location.

Before settling on Egg Harbor Gentry explored various options for expansion, considering areas like Madison’s west side, Milwaukee, and the Fox Valley. However, none of these locations seemed to fit until he stumbled upon the Egg Harbor building while attending a nearby beer festival with his wife.

The building underwent a complete transformation, taking on a charming Cape Cod-style appearance with wooden shingles. The interior decor mirrors the pub ambiance of the Atwood location. However, one notable difference is the addition of an outdoor beer garden and patio seating, accommodating over 200 patrons, which will showcase the vacation atmosphere and coastal feel of Door County, especially during the summertime.

The Egg Harbor One Barrel will feature its own one-barrel brewing system, allowing them to continue brewing their signature craft beers on-site. To cater to the culinary needs of the patrons, an on-site kitchen will be operated by the popular Wild Tomato pizzeria, which is based in Sister Bay and Fish Creek

One Barrel’s success also had a ripple effect on Madison’s craft beer scene. It inspired a new wave of nanobreweries and small-scale operations, each with its own unique approach to brewing. The brewery’s emphasis on quality, innovation, and community set a standard for excellence that other aspiring brewers sought to emulate. Madison’s craft beer culture flourished as a result, with a growing number of local breweries offering a diverse range of high-quality beers.

One Barrel holds a special place in Madison’s craft beer history. As the city’s first nanobrewery of the modern craft era, it paved the way for a new generation of brewers and beer enthusiasts. Founder and brewer Peter Gentry’s dedication to quality, innovation, and community created a unique experience for patrons, who eagerly awaited each new release and celebrated the artistry of craft brewing. One Barrel remains a testament to the power of passion, creativity, and a pint of handcrafted beer.

One Barrel Brewing Company is rooted in historic brewing lore. We hope that once you step inside the brewery/tasting room you will feel like you’re sitting in the same room that your beer was made. Mostly because you will be … but also because every aspect of the brewing process is on display! We want you to see just how simple our small scale approach to brewing is. And we hope that you might be motivated to try your hand at brewing … or even simply to try a beer you’ve never had before. We offer delicious snacks from local vendors to compliment our beers. Feel free to carry-in food as well. 

Beers Tried

Gentry's Blackberry Bramble Hard Cider

Cider – Other Fruit

5.5% ABV

Rating: 3.36

Crisp, off-dry cider enhanced with blackberries!

Gentry‘s Granny's Apple Crisp Cider

Cider – Herbed / Spiced / Hopped

5.5% ABV

Rating: 3.59

Cider w/ vanilla, cinnamon, & graham cracker

Cookie Monster

Stout – Imperial / Double Milk

8.2% ABV

Rating: 3.84

Imperial milk stout brewed with rolled oats, chocolate malts, and roasted barley for a complex and deep malt character. A touch of lactose rounds out this brew with just a hint of sweetness.

Pete's Wheat

Wheat Beer – Hefeweizen

5% ABV

Rating: 3.67

This nod to our pal, Farmer Pete the Penguin, is a real traditional patio pounder. Brewed with traditional German Hefeweizen ingredients like red wheat, pilsner malt, and a Munich yeast, Pete’s Wheat has the light hazy straw color and citrus notes you’re looking for on a warm day.

Door County Trolley Red Cherry Lager

Lager – Amber / Red

4.8% ABV

Rating: 3.58

Brewed each Summer as a nod to our friends who run the iconic Door County Trolley around Wisconsin’s finest peninsula. This mellow lager features additions of high quality dark cherry juice, giving a gorgeous deep ruby hue and a lovely cherry flavor without cloying sweetness. Available all over the state in limited supply each Summer.


IPA – New England / Hazy

6% ABV

Rating: 3.86

Hazy, Juicy, New England-y, whatever you call them, this style of beer is so tasty and delicious that we couldn’t help making our taproom only Hypercolor NE IPA available everywhere! Oats, wheat, and copious amounts of dry hopping give this beer its full bodied, sweet, and juicy taste. And un-like those Hypercolor t-shirts from the 90’s, this trendy style is here to stay!
Hops: Citra, Mosaic, Centennial

Ninja Dust

IPA – New England / Hazy

6.5% ABV

Rating: 3.78

Juicy IPA that is bursting with citra, mosaic and centennial hops giving the brew an easy drinking citrus forward hop profile.

Up North Wisconsin Lager

Lager – American

5% ABV

Rating: 3.55

What could be better than sipping a classic refreshing lager while relaxing in Wisconsin’s beautiful and serene northern areas? We don’t know, and we don’t want to know. Enjoy this new seasonal release on draft or straight from the can at your neighborhood bar or favorite fold-up chair. Watch the sun rise and/or set and take er easy with Up North.

Poppin’ Cherry

Fruit Beer

5% ABV

22 IBU

Rating: 3.45

Nutmeg and Cinnamon infused cherry ale

Wintry Mix

Porter – American

5% ABV

Rating: 3.70

Deep brown colored ale with a roasted malt finish reminiscent of an American Porter.

King Leonidas And His Brave Men

IPA – Imperial / Double

8% ABV

63 IBU

Rating: 4.46

A big citrusy double IPA brewed with Citra, Cascade, and love. A touch of mango makes it pop. Slightly hazy with a long lasting white foam cloud on top.

Pepper Czar

Stout – Imperial / Double

9.6% ABV

Rating: 4.2

Russian imperial stout brewed with cocoa, cayenne, and cinnamon.

Olbrich Oktoberfest


5.9% ABV

Rating: 3.67

Brewed as an exclusive Oktoberfest beer for The Biergarten at Olbrich Park.

Breakfast Beer

Stout – Coffee

8.5% ABV

60 IBU

Rating: 3.80

We feel beer is an acceptable breakfast beverage. And this beer speaks directly to that. Made with a healthy dose od oats and maltodextrin to give a robust mouth feel. This beer will fill you up and help you start your day right. Roast barley and chocolate malt also call to mind the taste of your morning coffee!

Gentry's Dry Hard Cider

Cider – Dry

6% ABV

Rating: 3.47

Made with naturally gluten free Washington apples, this hard cider stands out by being dry and easy to drink. And since it comes from One Barrel, you know it’s going to be good. We even put it in cans so you can take Gentry’s Dry Hard Cider with you everywhere! Like we said, it’s gluten free, all natural, and contains no sulfites. We hope you’ll enjoy.

Fanny Pack

IPA – American

6.5% ABV

Rating: 3.59

This throwback IPA is a reminder of what got us all into IPA in the first place. Fanny Pack has a nice malt backbone that allows the piney Chinook hops to shine without blowing out your pallet with bitterness.

Copper Stag


5.3% ABV

30 IBU

Rating: 3.50

Our Fall/Winter offering is a perfect beer for the changing seasons here in Wisconsin. Made with high quality Pilsner and Munich malts, it is easy to drink but still hearty and flavorful. We add color with caramel and chocolate malts. And round it all out with Noble German Tettnag hops.

The Commuter


4.8% ABV

22 IBU

Rating: 3.61

This is very true to the style that originated in Koln (Cologne), Germany. Our Kolsch is unfiltered and cold-conditioned. The result is a beer that is clean and refreshing, with a crisp finish. It is agreeable without being boring; the beer lover’s session ale. (original release 7/2012)

Penguin Pale Ale

Pale Ale – American

5% ABV

40 IBU

Rating: 3.53

We are thrilled to announce the re-launch of our original flagship brew, Penguin Pale Ale. With a new package design and revamped recipe, this American Pale Ale is lighter in color. Featuring Centennial, Amarillo and Simcoe hops and a toned-down malt bill for an easy drinking,hoppy brew.

Banjo Cat

IPA – Black / Cascadian Dark Ale

6.2% ABV

69 IBU

Rating: 3.62

This beer is black in color but very smooth and does not have a bitter malt flavor found in many stouts and porters. It is aggressively hopped, including a dry hop addition that gives Banjo Cat a strong citrus aroma and vibrant flavor resulting in a well-balanced black ale.