We Buried a Keg in Our Front Yard and Fermented Beer Underground

Most homebrewers worry a lot about keeping their beer at the right temperature. Fridges, temperature controllers, water baths. It adds up fast. But people have been keeping things cold and fermenting food underground for thousands of years. So we asked ourselves: what if we just buried a keg in the front yard?

We did it. It worked. And the beer might be the best thing we have ever brewed.

Why Burying Beer Actually Makes Sense

Before you write this off as a silly idea, hear us out. There are two real reasons why the ground is a great place to ferment beer.

First, the ground stays cold. Before refrigerators, people buried food to keep it from going bad. The English still serve cask beer at cellar temperature, which is pretty much the same as ground temperature. Cool and steady.

Second, yeast like things steady. When yeast turn sugar into alcohol, they do their best work when the temperature does not bounce around. The ground does not swing from warm to cold the way your house does. That steady temperature means happier yeast and better beer.

We dug a hole in our front yard and stuck a thermometer in. It read just above 60 degrees F. That is right in the sweet spot for an English golden ale.

Building the Party Rock

We needed a way to hide the keg. A full keg of delicious beer sitting in your front yard is just asking for trouble. So we grabbed one of those fake plastic rocks people use to hide septic lids. We drilled a small hole in the side with a hole saw, ran a beer faucet and a tap handle through it, and connected it to the keg below.

The whole setup took maybe two minutes to put together. From the street it looks like a normal rock. Lift the lid and you have a fully working tap straight out of the ground.

We call it the party rock.

The Keg We Used

Normal kegs do not work great for fermenting beer. They have a tube that runs from the top all the way down to the bottom. When you go to pour, you pull from the very bottom where all the yeast gunk settles. Your beer comes out cloudy and gross.

The keg we used is designed to both ferment and serve. For this beer, we used a floating dip tube. Instead of pulling from the bottom, it floats on top of the liquid. So you are always pulling from the cleanest part of the beer. That means you can ferment and serve from the same keg without ever having to move the beer.

That was really important for this project since the keg was going to stay in the ground for the whole process.

How the Brew Day Went

We brewed a 5 gallon batch of English golden ale right in the backyard using our electric brewing system. The recipe uses some really special grain: Regenified Southern Select, which is grown using farming methods that are good for the soil and the planet. We paired it with East Kent Goldings hops, which give the beer a soft, earthy, slightly floral flavor that fits the style perfectly.

After brew day, we drained the wort straight into the keg using gravity, pitched our yeast, put the lid on, and set the spunding valve to one bar. That lets the beer build up just enough pressure to carbonate itself naturally as it ferments. Then we dropped the keg in the hole, packed sand around it, covered it with the rock, and waited.

Day one, nothing happened. We got a little nervous. Day two, fermentation was going full speed.

Recipe Kit here.

What It Tasted Like

After two weeks, we tapped it straight out of the ground. Lightly carbonated, clear, and honestly beautiful in the glass.

The aroma had honey, a little citrus, and a floral note. The taste was balanced, not too bitter, not too sweet, with no bad flavors at all. It had more flavor than our normal beers, probably because it was served a little warmer than you would get from a fridge. Cold beer mutes flavor. This one let everything shine.

We both agreed: best thing we have brewed in a long time. Ground to glass.

The Recipe: Asheville Golden Ale

Style: British Golden Ale Batch Size: 5.3 gallons ABV: 3.9% IBU: 26 Color: 4 SRM (pale gold) Original Gravity:1.037 Final Gravity: 1.007 Carbonation: 2.4 CO2 volumes

Fermentables (7 lb 13.9 oz total)

• 4 lb 5.8 oz - Regenified Southern Select (55.5%)
• 2 lb 10 oz - Base Camp 2 L (33.3%)
• 14.1 oz - Golden Wheat 3.5 L (11.2%)

Hops (2.16 oz total)

• 1.02 oz East Kent Goldings (5.5% AA) at 60 min
• 0.57 oz East Kent Goldings (5.5% AA) at 10 min
• 0.57 oz East Kent Goldings (5.5% AA) at 0 min
• 15 minute hop stand at 176 degrees F

Yeast

• 1 package Lallemand (LalBrew) Nottingham Yeast

Water Additions (mash)

• 0.3 g Calcium Chloride
• 1.7 g Epsom Salt
• 1.8 g Gypsum
• 3 ml Lactic Acid 85%

Mash Profile

• 154 degrees F for 60 minutes (saccharification rest)
• 170 degrees F for 1 minute (mash out)

Fermentation

• 66 degrees F for 7 days primary
• Brewed for underground fermentation at approx. 60 degrees F ground temp

Water Profile (Asheville City Water, English Ale)

• Ca 22, Mg 6, Na 16, Cl 10, SO 66, HCO 39
• Mash pH: 5.52

Should You Build Your Own Party Rock?

Yes. Here is what you need:

• A fake plastic rock (the kind sold to hide septic lids)
• A beer faucet and shank
• A tap handle
• A hose and ball lock fitting for your keg
• A keg that can ferment and serve (we use our own floating dip tube keg fermenter)

Dig a hole, drop the keg in, pack some sand around it for stability, and drill a hole in the rock for your tap. That is really it.

The ground does a lot of the work for you. The temperature is steady, the beer stays cool, and you end up with something that tastes like a proper English cask ale served straight from the earth.

We are already planning the next batch. Maybe even a full beer garden with four kegs buried in the yard. The neighbors are going to have questions.