Fast & FREE Shipping!

This blog provides information for educational purposes only. Read our complete summary for more info.

August 8, 2017
Last updated

Brewing Beer: Blackberry Porter Homebrew

Owner of Clawhammer Supply
blackberry beer homebrew recipe

It's summer right now and berries are ripe for the picking in our neck of the woods. We took a trip out to a friends farm and nabbed several gallons of blackberries for our latest creation, a robust blackberry porter.

To be honest, this is purely experimental. We found a porter recipe online that looked good to us and brewed it with the intention of adding blackberries. We have no idea how this one is going to turn out so what we'll do is ferment the batch of porter in a large carboy then split it into two 2.5 gallon (9.5 liter) fermenters and add blackberries to one of them during secondary.

We filmed the entire process, which is below. Here's the brewing process. More videos and the recipe are further down.


Beginning water volume: 7.74 gallons (29.3 liters). We didn't adjust chemistry.


  • Pale Malt
  • Maris Otter
  • Crystal 60
  • Crystal 120
  • Chocolate Malt
  • Carafa II
  • Melanoiden Malt


We mashed at 152F (66.7C) and opted to skip the recommended 168F (75.5C) mash out due to time constraints. Gravity targets are in benchmark section below.

mashing in

Mashing in

stirring mash

Stirring mash to remove any doughballs


The Boil

  • Columbus hops at the boil (60 minutes)
  • Whirlfloc at 15 minutes,
  • and Willamette at 15 minutes as well

wort boiling in kettle with hop silo attached

Wort boiling in our kettle with the hop silo attached


We added an English Ale yeast (White Labs WLP002) and fermented in the high 60's (~19.4C) during primary.

pitching a yeast starter into our porter

We made sure to make a yeast starter for this beer


  • Pre-boil gravity 1.054
  • Post boil volume 6.04 gallons
  • Post-boil gravity 1.063
  • Final volume (after fermentation) 5.50 gallons

Before brewing, we actually picked some blackberries. Why blackberries? They were in season and we had a line on a whole bunch of them. Our buddy Jack took us to a remote section of his farm and we picked away. Here's the video:


After primary fermentation finished, we added 2.5 pounds (1.1 kg) of blackberries to half of our batch of robust porter (we kegged the other half with no modifications). The reason we split the batch was because it's best to add a pound of berries per gallon to allow the flavor of the fruit to come through in the final product and we only had 2.5 pounds of berries! This worked out well because half of our batch was 2.5 gallons.

picking wild blackberries

Emmet picking wild blackberries

2.5 pounds of blackberries

It took a while to pick this many blackberries

The procedure for adding the berries is as follows.

  1. Freeze the berries to kill (most of) the wild yeast / bacteria that undoubtedly is living on the fruit.frozen blackberries
  2. Put the fruit in a blender (that has been sanitized with starsan) and add some sterile (boiled) water.frozen blackberries in a blender
  3. Blend the berries to make a puree.
  4. Rack the beer to a secondary fermenter and add the berries.adding blended blackberries to a secondary fermenteradding porter to carboy with berries

Here's a video of us completing all of these steps:


After infusing the secondary fermenter with the berries we left it sit for another week at about 70 degrees (21.1C) to let things mellow out. This probably reactivated the yeast, as there was likely some fermentable sugar in the berries. After secondary fermentation was complete we did a 24 hour cold crash and then racked the beer to a keg. Pro tip, use a cheese cloth to filter out any pulp and seeds from the berry juice while racking into the keg.

putting a mesh bag into a 2.5 gallon keg before racking our blackberry porter

We put a mesh bag into our keg before racking

In fact, here's the entire kegging video:

Once our two porters were carbonated, we tasted both to see how they turned out. The first one we tried was the porter with blackberries. We had no idea how a porter infused with wild blackberries would turn out, but upon tasting it we were very satisfied. We could immediately taste how clean our blackberry porter was, so there was fortunately no contamination and no off-flavors. When we filmed the tasting video below, our blackberry keg was almost empty. We loved this beer and recommend you try making a wild fruit beer as well.

Our porter with no blackberries was much more chocolatey, we described it as almost an Ovaltine flavor with a bit of sweetness to it. The porter with no blackberries definitely turned out great, but it wasn't nearly as surprising as our porter with blackberries.

Kyle Brown is the owner of Clawhammer Supply, a small scale distillation and brewing equipment company which he founded in 2009. His passion is teaching people about the many uses of distillation equipment as well as how to make beer at home. When he isn't brewing beer or writing about it, you can find him at his local gym or on the running trail.

  • What are the malt weights in the grist?

    Posted by Evandro on August 05, 2019
  • I have a couple gallons of Berries in my freezer that I’m looking for a home for. This looks like what the doctor ordered. I’m going to Mix them into an American Wheat that also includes Honey so that should be fun!

    Posted by Mikegyver on September 14, 2018
  • Was there a follow up video as to how this turned out? Very interested in making this and just wondering would you make it again?

    Posted by Ronan on August 17, 2018
  • Ah man, came here looking for the recipe… LOOKS LIKE A GOODIE.

    Posted by Dene on May 04, 2018

Leave a comment

Please note, the design of our website does not allow us to respond directly to blog comments. Please email us directly regarding questions about products. We don't answer questions about recipes, procedures, etc. However, feel free to leave a comment or respond to comments made by others!