Underground Mountain Brown
Founders Brewing Company

Underground Mountain BrownUnderground Mountain Brown
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Brown Ale - American
Ranked #1
Ranked #590
4.36 | pDev: 7.11%
Founders Brewing Company
Michigan, United States
Underground Mountain BrownUnderground Mountain Brown
Notes: Barrel-Aged Sumatra Mountain Brown

Underground Mountain Brown is the harmonious drinking experience only achieved when our imperial brown ale, earthy Sumatra coffee and a year aging in caves below Grand Rapids comes together. A team of malts complement the bold sumatra coffee perfectly, while time spent immersed in oak creates layers of depth and complexity. A celebration of the barrel, the bean and everything in between.

30 IBU
Reviews: 235 | Ratings: 719 | Log in to view all ratings and sort
Photo of TinFang
TinFang from California

4.42/5  rDev +1.4%
look: 4.25 | smell: 4.75 | taste: 4.25 | feel: 4.25 | overall: 4.5

Bourbon bourbon chocolate bourbon bourbon coffee wood bourbon bourbon. Delicious, has glass appeal but mostly one dimensional. I'm glad I bought this but might not buy it again.

Aug 02, 2021
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mntlover from Tennessee

4.62/5  rDev +6%
look: 4 | smell: 5 | taste: 4.5 | feel: 4.25 | overall: 4.75

Pours murky dark bronw with anal tan head that falls to ring only light lace.

Aroma is nice malts, brown sugars, coffee, good bourbon notes without being too much, vanilla, oak, caramel. Big malty with lots of nuances. Hard to imagine a better nose on a brown ale just superb.

Taste is sadly only great not perfect like the aroma. But still following the aroma big malty treat, lots of brown sugars, vanilla, oak bourbon, caramel and coffee.

Mouthfeel is only big medium carbonation lighter side of medium. Doesn't really feel as big as the abv.

Overall one of the best smelling beers I have had in years I believe. Great full bodied flavor.

Jul 20, 2021
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mothman from Minnesota

4.25/5  rDev -2.5%
look: 4.25 | smell: 4.25 | taste: 4.25 | feel: 4.25 | overall: 4.25

Bottle. Tan head, caramel brown color.

Great coffee notes. Cocoa and chocolate. Caramel. Oak, vanilla, and bourbon. Smooth, creamy. Smooth. Everything is well balanced. This is a great brown ale.

Jun 21, 2021
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StJamesGate from New York

4.21/5  rDev -3.4%
look: 3.75 | smell: 4 | taste: 4.5 | feel: 3.75 | overall: 4.25

Viscous garnet brown with just a film of tan bubbles; Tia Maria + rum nose; walnuts, crusty Irish loaf, brown sugar, sweet coffee, thread of vanilla, boozy hit, smoke + pecan pie finish; round, smooth, medium.

3.75 4 4.5 3.75 4.25

I’m all over the place with this one.
It’s so sweet - the nose hints that liqueur strength is gonna keep this balanced, but that doesn’t happen. All the additions are burying what could be a good base brown. And it’s thin for the strength + low carb for the sweetness.
At the same time, there’s a ton going on here. The triangle between bourbon, coffee and brown malt leaves room for all sorts of nuances like coconut + butterscotch (especially in baby sips, which, as mentioned, the ABV, carb+ body kinda demand).
Most notably, the oak + roasted combine for a unique kind of smokiness - I’d say have this with a cigar, and I don’t even smoke.
On the other hand, it’s not’s not a great brown, a great coffee beer, or a great bourbon BA beer.
On the other other hand, it’s idiosyncratic, complex + ultimately satisfying.

Not anything that it says it is, but enjoyable just the same.

May 28, 2021
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Whyteboar from Michigan

5/5  rDev +14.7%
look: 5 | smell: 5 | taste: 5 | feel: 5 | overall: 5

This thing drinks like a BA stout in some ways but isn't, and when comparing side by side the difference is very noticeable, hence my rating. If you need to compare against a beer 2 tiers higher, you are generally talking exceptional.
The pour was enticing, an opaque rich dark brown capped with a dense tan head that leaves delicate lacing all the way down the glass. The aroma is warm malts softly couched in coffee and cocoa. For someone who really drinks a lot of stouts, this impressed me no end. Just excellent.
Then you get to the taste, wow. For a brown, this punches way above its weight. The flavor follows the aroma, deep and rich malts swirl through and soak your taste buds and just before you start to think it's going to be sweet, the coffee kicks in and gently bitters up the swallow.
Because of the high ABV, I've generally grabbed a stout when wanting something rich, dark and tasty. I will reconsider that and put this one into the rotation. I am especially impressed by the feel - more viscous than a non-BA brown, but less than a BA Porter or Stout (Good ones anyways)
Man, so glad these guys are local. I can get this just about any time!

May 03, 2021
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zac16125 from South Carolina

4.08/5  rDev -6.4%
look: 4.5 | smell: 4.5 | taste: 3.75 | feel: 4.25 | overall: 4

Pours dark brown, opaque, 2 fingers width of dense very light tan head with good retention. Aroma is huge, rich coffee notes. Moderate strength barrel characters with great notes of bourbony vanilla. Taste doesn’t quite follow and is a bit of a let down. Coffee is there but it’s more generic bitterness than rich smooth coffee notes. Bourbon notes are there, but again it’s a bit harsh as opposed to smooth bourbony goodness. Not a ton of base beer characters are present, perhaps some caramel and very subtle roastiness. Mouthfeel is smooth, body on the fuller end for a brown ale but is welcomed. ABV is completely unnoticeable which is impressive for a double digit brown ale. It’s quite drinkable. Overall, it’s a good beer def has its pros and cons.


Mar 08, 2021
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klarcbarr3 from Michigan

4.5/5  rDev +3.2%
look: 4.5 | smell: 4.5 | taste: 4.5 | feel: 4.5 | overall: 4.5

Founders Underground Mountain Brown.. another fine addition to Founders' Barrel Aged series. A pour into a pint glass renders a full 1 inch head, which thins but leaves enough to produce fine lacing throughout consumption. The nose is full, with bourbon, malt, coffee, and chocolate notes providing a big HELLO! The taste is exactly what is promised.. a classic malty brown ale, with coffee, lovingly aged in bourbon barrels. As such, this beer is simpler than the more famous KBS and CBS barrel aged Founders Brews.. it is refreshingly straightforward, and delicious. The mouthfeel is full and robust. This a very well-conceived and executed beer. Brown Ales have been on the decline since the heyday of Petes' Wicked Ale. Underground Mountain Brown, a pricey 11.9% ABV variant, will not be the one to return brown ales to their glory days, but it should be warmly embraced as a fine reminder of those days on special occasions.

Feb 24, 2021
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misteil from Ireland

4.35/5  rDev -0.2%
look: 4.25 | smell: 4.75 | taste: 4.25 | feel: 4 | overall: 4.25

look: big frothy off white to tan coloured head with amazing retention for its strength, beer is a dark brown mahogany colour, pretty clear, looks very pretty.

smell: the aroma is just fantastic, earthy, lots of coffee, very nutty, oaky, treacle, fudge, caramel, molasses, somewhat herbal, some whiskey, some sherry, nicely sweet and rich, glorious smelling beer.

taste: not quite as insane as i hoped it would be but it’s damn tasty, the coffee again is absolutely wonderful, nicely sweet, nicely earthy and rich, oaky, bold malt flavour, treacle, dark chocolate, fudge, lot of whiskey, tobacco, pepper, medium to strong bitterness on the finish, sweet flavours and coffee lingers on the finish, great stuff.

feel: medium to full bodied, light carbonation, not as massive as you’d anticipate a 12% brown ale to be, lot of alcohol warming and lingering bitterness, but bizarrely drinkable for such a strong beer.

overall: everything founders makes seems to just be so good, and this is no exception, great beer.

Feb 20, 2021
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mushroomcloud from Texas

4.24/5  rDev -2.8%
look: 4 | smell: 4.25 | taste: 4.25 | feel: 4.25 | overall: 4.25

12oz bottled 8-27-20, opened 12-19-21.
2 finger beige head, very good retention. Dense foam slowly recedes and leaves thick lacing in its' wake.
Dark brown with limited visibility. Spotty, wispy lacing.
Big nose of spicy wood - almost cedar like - and freshly ground fine coffee. Rich earth/dirt.
Strong coffee, nutty, malty, with a restrained booziness. Rich flavor.
Full body, smooth mouthfeel, creamy carbonation. Long and just slightly off-dry finish.

Feb 20, 2021
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backblast from Alaska

3.9/5  rDev -10.6%
look: 4 | smell: 4 | taste: 3.75 | feel: 4 | overall: 4

Not really a fan of espresso, but beside that, I can tell it is a nice brown ale. It has heavy espresso coffee and a boozy character to it and leaves a bitter, dry coffee aftertaste. If you like espresso, you'll like this one.

Feb 13, 2021
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krh from Illinois

4.25/5  rDev -2.5%
look: 4.25 | smell: 4.25 | taste: 4.25 | feel: 4.25 | overall: 4.25

Enjoyable brown ale base and hints of coffee. A nice change of place in the sea of BBA offerings, but think I still prefer a nice stout or ale like Backwoods Bastard over this.

Jan 24, 2021
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Antg8989 from New Jersey

4.76/5  rDev +9.2%
look: 4.5 | smell: 4.75 | taste: 4.75 | feel: 5 | overall: 4.75

Pours brown with a light brown head. Aroma is coffee, chocolate, bourbon and marshmallow. Taste is just the right amount of roasted coffee with pleasant warming hints of bourbon. Some chocolate as well. Feel is perfectly carbonated for the style. Overall, fantastic.

Jan 14, 2021
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GoBearsWalter34 from Illinois

4.49/5  rDev +3%
look: 4 | smell: 4.25 | taste: 4.75 | feel: 4.25 | overall: 4.5

Pours darn brown with a thin, tan head.
Smell of coffee, fudge, malt.
Awesome coffee taste! Brownie and little on the bourbon. Nice Carmel malt.
Not a big mouthfeel, but it is a brown.

Dec 31, 2020
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blazerkor from Nevada

4.84/5  rDev +11%
look: 4.5 | smell: 4.75 | taste: 5 | feel: 4.75 | overall: 4.75

It smells of some otherworldly cocoa bread, slightly musty and alcoholic.

The taste is dank bitter chocolaty alcohol with hints of bread and a little spicy.

The finish is only mildly bitter and has coffee notes with warming alcohol. It's both dry and satisfying.

The mouthfeel like most browns is both thin and smooth but it leaves a little bitterness and the burn if alcohol.

To date this is my second favorite brown to Rogue Hazelnut Nectar but it's still divine and gets a 5.6 out of 6.

Dec 29, 2020
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vi11am from Pennsylvania

4.27/5  rDev -2.1%
look: 4.25 | smell: 4 | taste: 4.5 | feel: 4 | overall: 4.25

Nice dark brown, more like a stout. Coffee, and chocolate, cinnamon on the nose, Carmel hints as it warms, pepper, and vanilla on the finish. Great flavor, easy session.

Dec 24, 2020
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Andrew_NYC from New York

4.36/5  rDev 0%
look: 4 | smell: 4.25 | taste: 4.5 | feel: 4.5 | overall: 4.25

Smell is not super strong but is quite bourbon-y.

Taste is big and bourbon-y as you'd expect from a barrel-aged beer but without the same malty backbone as a stout. But there is the nice toastyness of a brown ale. There's plenty of alcohol in the finish for a nice lingering, warming finish. The bourbon barrel is the main flavor that comes through.

A great brown ale to sip on, if you like barrel-aged beers.

Dec 17, 2020
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rudiecantfail from Pennsylvania

4.42/5  rDev +1.4%
look: 4.75 | smell: 4.5 | taste: 4.25 | feel: 4.5 | overall: 4.5

12 ounce bottle poured into a tulip glass.

L---Opaque brown with a big, frothy head that had very good retention and excellent lacing.

S---Dark malts. Chocolate & nuttiness.

T---Chocolate & nuts, like the nose.

F---Full & creamy. Feels like a serious beer.

O---A damn fine beer. I can't believe I found it in a 11.99 pick your sixer pile. This seems like a much more expensive beer.

Dec 13, 2020
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BucBasil from Rwanda

4.56/5  rDev +4.6%
look: 4.5 | smell: 4.75 | taste: 4.5 | feel: 4.5 | overall: 4.5

A: The beer is a dark brown color that has some cola notes on the sides when held to light. Head is frothy, khaki tan and grew to 2 fingers with OK retention.

S: Toasted malt, milk chocolate, cafe au lait, cinnamon, wood, brown sugar, toast, vanilla. A very complex, but inviting aroma.

T: Chewy, bready, slight chocolate flavor, molasses, caramel, toast, light vanilla. Booze is really covered up well. Retains some of the bourbon character without the heat to it. Coffee wasn't as pronounced as I expected, and that might be a good thing. This has a surprising amount of balance, and if the coffee was any more this could get out of whack.

F: For the strength, this is pretty smooth.

Overall: I love brown ales, and this one hits the mark for me. I definitely recommend this one. Of this barrel aged series from Founders, this one is maybe the most consistently drinkable and accessible. Still, it has a load of complexity and depth. Loved this.

Dec 09, 2020
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BlackBeerPirate from Illinois

4.49/5  rDev +3%
look: 4.25 | smell: 4.5 | taste: 4.5 | feel: 4.5 | overall: 4.5

Taste: Complex. nutty, smooth coffee, dark malts, chocolate, some boozy bourbon woody notes, semi sweet. Bold coffee bean cocoa, sweet malty bourbon nose. Dark brown hue, semi clear, tall tan head nice ring lattice. Medium to full body. Toast tasty after dinner Brown. 30 IBUs

Nov 30, 2020
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beerguy04 from Illinois

4.49/5  rDev +3%
look: 4.25 | smell: 4.5 | taste: 4.5 | feel: 4.5 | overall: 4.5

Pours a dark brown with red hues in the light. Tan head two fingers width. Has a roasted coffee bean smell. Taste is similar, but with a heavy malt presence with the roasted coffee beans. Mouthfeel is medium. Overall, definitely another brown ale that I enjoy.

Nov 25, 2020
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IPAs_for_days_13 from Texas

4.29/5  rDev -1.6%
look: 4.5 | smell: 4.75 | taste: 4 | feel: 4.25 | overall: 4.25

L: Pours a dark brown, almost black color with a tall beige colored head.
S: Smells very sweet upfront, rich notes of coffee, has some nice aromas of chocolate & bourbon; very boozy.
T: Follows the nose, has a nutty flavor to it, has a 'toasted' quality to it that is really nice with the chocolate flavors.
F: Very smooth nitro body to it that warms as you consume, has a creamy feel.
O: Very complex brown ale that is well worth the try. Cheers!

Nov 24, 2020
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Cdriver0414 from Kentucky

5/5  rDev +14.7%
look: 5 | smell: 5 | taste: 5 | feel: 5 | overall: 5

Look- a dark rich brown
Smell- bourbon with a hint of cherry malt
Taste- rich malty nuttiness with a strong bourbon infusion on the back end
Feel- great mouth feel
Overall- easily the best brown ale on the market a must try

Nov 17, 2020
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Troy-Hawaii from Hawaii

4.5/5  rDev +3.2%
look: 4.5 | smell: 4.5 | taste: 4.5 | feel: 4.5 | overall: 4.5

Bought a single 12oz bottle $3.99 Village Bottle Shop
57 days old
Smell of chocolate, followed by bourbon, then of coffee
Dark black color
Heavy mouthfeel
Low carbonation
Taste of coffee, dark chocolate, bourbon finish, fairly smooth, hides alcohol really well
Overall a great beer. Would buy again.

Nov 14, 2020
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harrypowers from Massachusetts

4.43/5  rDev +1.6%
look: 4.25 | smell: 4.25 | taste: 4.5 | feel: 4.5 | overall: 4.5

Pours an opaque dark brown with a small short lived head.

Smells of coffee and sweet malt and alcohol. Tastes primarily of coffee with a bit of chocolate with a sweet boozy finish.

Medium heavy consistency with light carbonation. Lush syrupy mouth feel.

This is a well crafted smooth sipper!

So happy to find it in Boston where I thought it was not available

Nov 09, 2020
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Smakawhat from Maryland

4.45/5  rDev +2.1%
look: 4.5 | smell: 4.5 | taste: 4.5 | feel: 4 | overall: 4.5

Poured from the bottle into a Founders tulip glass.

Deep rich creamy yellow tan like head of three fingers. It sits like a loaf of cake on top of a very dark mahogany brown body. Up to the light there are some gorgeous ruby notes of red color throughout the glass. Gorgeous looking brew.

Aroma is really devine. Light nutty notes, and touching oak wood seem to come off on the nose. Faint dark chocolate in little pieces of shaved chocolate bar with a touch of pine like heat. Exceptionally creamy smelling, with touches of light vanilla as well. Real solid impressive nose

Palate seems a bit more level and less spectacular. Mid palate hits with a wonderful crackling toast and faint hints of roasty caramel tones. Milky sensing chocolate a bit more with a coffee cream flavor that hits real superbly. Light vanilla, woody oak tones, and nearly tasting splinters in my mouth.

Very solid beer and does remind me much of KBS like character, but lacks the body and mouthfeel to propel it I think into stratosphere levels. I think this is more to style for a brown ale, so it is in the right ballpark, but you really cant complain much here.

Oct 29, 2020
Underground Mountain Brown from Founders Brewing Company
Beer rating: 96 out of 100 with 719 ratings