Sometimes you don’t want a big, heavy beer that knocks you on your ass after a couple of pints.
Sometimes you just want a good, clean, refreshing beer you can enjoy without overdoing it.
That’s exactly what we’re brewing today.
This 4% Session Kölsch is my take on the classic German beer style, with a slightly lower alcohol content than you’d normally expect. We’re keeping the light golden colour, subtle bready malt flavour, gentle German hop character, and crisp finish.
The goal is simple: make a beer that’s easy to drink without making it taste like watered-down beer.
And this particular recipe came from a suggestion by one of our Make Beer Easy viewers.
Let’s get brewing.
Why I Decided to Brew a 4% Kölsch
One of our viewers, @AndresAcebalDominguez, commented on my video about drinking less as a homebrewer and suggested I make my own 3.5% Kölsch.
I liked the idea.
I’ve been thinking more about making beers that are enjoyable without always pushing the alcohol content higher and higher.
But I decided to bump his suggestion up slightly.
Instead of 3.5%, we’re targeting 4% ABV.
That gives us a little extra room to build some malt character and body while still keeping this beer firmly in session territory.
And with all the different beer styles you can brew at home, why not have a nice, crisp, lower-alcohol option on tap?
You can still have plenty of flavour without brewing a 7% beer every time.
What Is a Kölsch?
Kölsch is a beer style traditionally associated with Cologne, Germany.
It’s an interesting one because it sits somewhere between what people normally think of as an ale and a lager.
Kölsch uses ale yeast, but it’s generally fermented on the cooler side for an ale and then cold-conditioned to help develop a clean, smooth finish.
The result is a pale, refreshing beer with a delicate balance of malt, hops, and yeast character.
It’s not supposed to be a hop bomb.
It’s not supposed to taste like a sweet blonde ale.
And it’s definitely not supposed to be a big, heavy beer.
A good Kölsch-style beer is subtle. The flavours work together without any one ingredient taking over.
My version is deliberately a little lower in alcohol than a traditional Kölsch.
We’re calling it a session Kölsch-style ale, rather than pretending it’s a textbook competition recipe.
What Will This Session Kölsch Taste Like?
Here’s what I’m aiming for with this recipe.
Appearance: Light golden, with a clear finish after cold conditioning and a nice white head.
Aroma: Gentle grainy and bready malt, with a little floral or herbal character from the German hops.
Flavour: Clean Pilsner malt up front, a touch of breadiness from the Cologne malt, mild noble-hop character, and a balanced finish.
Mouthfeel: Light and refreshing, but not thin or watery.
Finish: Crisp, fairly dry, and clean enough to make you want another sip.
At around 4% ABV, this should be a great beer for someone who wants to enjoy a couple of pints without feeling like they’ve been drinking a double IPA.
Watch Me Brew This 4% Session Kölsch
Want to see how I put this beer together?
In the video below, I walk you through my 4% Session Kölsch recipe, including the grain bill, hop additions, and brewing process.
This one was inspired by a Make Beer Easy viewer who suggested brewing a 3.5% Kölsch. I decided to bump it up to 4% and see if we could make a crisp, refreshing beer without sacrificing flavour.
Watch the video below, and let me know what you think!
And if you enjoy the video, be sure to subscribe to Make Beer Easy on YouTube for more homebrewing recipes, tips, and experiments.
Cheers!
4% Session Kölsch Recipe — Quick Overview
This is an all-grain recipe designed around my BrewZilla brewing system, but you can adapt it to another all-grain setup.
Beer Style: Session Kölsch-Style Ale
Brewing Method: All Grain — BrewZilla
Batch Size: 5.5 US gallons into fermenter
Packaged Volume: Approximately 5 US gallons
Brewhouse Efficiency: 70%
Original Gravity (OG): 1.038
Final Gravity (FG): Approximately 1.007
Alcohol (ABV): 4.06%
Bitterness (IBU): 27.54
Colour (SRM): 3.86
Boil Time: 60 minutes
Mash Temperature: 152°F (66.7°C)
Mash Time: 60 minutes
Yeast: Fermentis SafAle K-97 German Ale Yeast
Carbonation: Approximately 2.5 volumes of CO₂
The ABV, bitterness, and colour figures are based on my Brewer’s Friend recipe calculations. Your actual results can vary depending on your system and fermentation performance.
Ingredients for My 4% Session Kölsch
One thing I like about this recipe is how straightforward the ingredients are.
We’re using three grains, one hop variety, and one yeast strain.
Nothing complicated.
Grain Bill
Weyermann Pilsner Malt — 5.5 lb (2.49 kg)
Weyermann Cologne Malt — 2.5 lb (1.13 kg)
Weyermann Pale Wheat Malt — 0.5 lb (227 g)
Total Grain: 8.5 lb (3.86 kg)
Why These Grains?
Weyermann Pilsner Malt
This makes up the majority of the grain bill.
It provides the light colour and clean malt foundation we’re looking for.
Pilsner malt works especially well in lighter German-style beers where you don’t want a lot of caramel sweetness or heavy grain flavours.
Weyermann Cologne Malt
This is where we’re adding a little more personality.
Cologne malt brings a gentle bready character and can contribute subtle honey-like malt notes.
I wanted enough malt flavour to keep the beer interesting, especially since we’re targeting a lower alcohol content.
Weyermann Pale Wheat Malt
We’re only using half a pound, but it has a job to do.
Wheat malt can help improve head retention and contribute a little extra body.
That matters when you’re brewing a lighter beer.
I don’t want this thing drinking like flavoured water.
Hop Schedule
We’re keeping the hops traditional and simple.
Hop Variety: German Hallertau Mittelfrüh Pellets
Alpha Acid: 4.4%
60 Minutes Remaining: 1 oz (28 g) Hallertau Mittelfrüh
15 Minutes Remaining: 1 oz (28 g) Hallertau Mittelfrüh
Total Hops: 2 oz (56 g)
Calculated Bitterness: 27.54 IBU
Hallertau Mittelfrüh is a classic German noble hop known for its gentle floral, herbal, and slightly spicy character.
The 60-minute addition provides most of our bitterness.
The 15-minute addition contributes some additional bitterness along with restrained hop flavour and aroma.
We’re not dry hopping this beer.
We’re not doing a big whirlpool hop addition either.
The hops are supposed to complement the malt, not overpower it.
A note about substitutions: If you can’t find Hallertau Mittelfrüh, another suitable German noble-type hop could work, but you’ll need to recalculate your hop quantities based on its alpha acid percentage.
👉 How to Substitute Hops, Grains, and Yeast
Yeast
Fermentis SafAle K-97 German Ale Yeast — one fresh 11.5 g packet
K-97 is a German ale yeast that suits the clean, restrained character we’re trying to achieve.
The recipe uses an estimated attenuation of 81%, which gives us the calculated 4.06% ABV in Brewer’s Friend.
The yeast is particularly important here.
We’re not making an American blonde ale and throwing the word Kölsch on it.
The fermentation character needs to suit the beer.
For this batch, we’re keeping the fermentation controlled and giving the beer some cold-conditioning time afterward.
Equipment You’ll Need
You don’t need a commercial brewery to make this beer.
I’m using my BrewZilla, but the same recipe can be adapted for a traditional mash tun or a brew-in-a-bag setup.
You’ll need the basics:
- All-grain brewing system or suitable mash kettle
- Grain basket or brewing bag
- Thermometer
- Accurate brewing scale
- Fermenter with enough headspace
- Hydrometer or refractometer
- Wort-chilling setup
- Sanitizer
- Bottling or kegging equipment
- A way to control fermentation temperature
- Cold storage for conditioning
A good thermometer and hydrometer matter more than buying a pile of fancy accessories.
If you’re looking to improve your setup, I’ve put together the equipment I recommend for different brewing methods.
👉 My Recommended Beer Brewing Equipment
And if you’re already brewing all grain but want to make brew day easier, check out my accessory guide.
👉 Brew Day Equipment & Accessories
Affiliate disclosure: Make Beer Easy may earn a commission from qualifying purchases made through links on recommended equipment pages, at no additional cost to you.
How to Brew This 4% Session Kölsch
All right, let’s get into the actual brewing process.
Step 1: Prepare Your Brewing Water
For my BrewZilla, the starting water estimates are:
- Mash water: 4.75 US gallons (approximately 18 litres)
- Pre-boil target: Approximately 7.2 US gallons (27.3 litres)
- Into the fermenter: 5.5 US gallons (20.8 litres)
Heat the mash water to your calculated strike temperature so that adding the grain brings the mash to 152°F.
You’ll sparge after the mash to reach the pre-boil volume.
These are planning volumes, not guaranteed numbers for every BrewZilla setup. Your grain absorption, boil-off rate, and equipment losses will determine exactly how much water you need.
Use your own equipment profile and measured boil-off rate before brew day.
Water chemistry tip: For this pale beer, I want the mash pH in the approximate range of 5.2–5.6 when measured at room temperature.
The brewing software estimated a mash pH of 5.80, but that number wasn’t based on a verified water profile.
If you adjust your water, work from your actual water measurements rather than blindly adding salts or acid.
Step 2: Mash at 152°F for 60 Minutes
Add your crushed grains to the mash water, stirring carefully to break up any dry clumps.
Hold the mash at:
152°F (66.7°C) for 60 minutes
This gives us a balance between fermentability and body.
Since we’re making a 4% beer, I don’t want to mash extremely low and create something that finishes too thin.
We’re trying to keep the beer refreshing while preserving enough malt character to make it enjoyable.
If you’re using a BrewZilla, start your recirculation gently and monitor the grain bed.
There’s no prize for running the pump wide open and compacting your mash.
If you’re newer to all-grain brewing, here’s my complete walkthrough.
👉 All Grain Brewing Instructions
Step 3: Optional Mash-Out
At the end of your 60-minute mash, you can raise the temperature to approximately:
168°F (75.5°C) for 10 minutes
This is optional.
It can help prepare the mash for lautering, but you don’t need to complicate your brew day if your system works well without it.
I have an entire article explaining when this step is useful and when you can skip it.
Step 4: Lift the Grain Basket and Sparge
Once the mash is complete, raise your BrewZilla grain basket and let it drain.
Sparge with prepared water until you’ve collected approximately 7.2 gallons of wort before the boil.
Don’t treat that number as something you must hit regardless of your own equipment.
The important thing is collecting the correct volume and gravity for your system.
If your pre-boil gravity or volume is off, make adjustments before moving forward.
Step 5: Boil for 60 Minutes
Bring the wort to a full boil.
We’ll be boiling for 60 minutes.
Here’s the hop schedule:
60 minutes remaining: Add 1 oz Hallertau Mittelfrüh.
15 minutes remaining: Add the second 1 oz Hallertau Mittelfrüh.
0 minutes: Turn off the heat.
That’s it.
No dry hop.
No late hop bomb.
No need to turn a delicate Kölsch-style beer into something resembling an IPA.
The target bitterness is 27.54 IBU, calculated using the 4.4% alpha acid hops in the recipe.
If your hop package has a different alpha acid percentage, update your recipe calculator.
Step 6: Chill the Wort
After the boil, cool the wort to approximately:
65°F (18.3°C)
Chill using your preferred method.
Once the wort is cooled, transfer it into a clean, sanitized fermenter.
We’re aiming for approximately 5.5 gallons in the fermenter, with around five gallons left for packaging after fermentation and normal losses.
Take an original gravity reading before pitching your yeast.
Your target is:
OG: 1.038
Don’t panic if you’re a couple of points off.
Record what you actually achieved. That’s how you improve your brewing process.
Step 7: Pitch Your K-97 Yeast
Add one fresh 11.5 g packet of Fermentis SafAle K-97, following the manufacturer’s pitching instructions.
For this recipe, we’re pitching at approximately 65°F.
Use a clean, sanitized fermenter and appropriate airlock or blow-off setup.
And that’s the wort-making part finished.
Now the yeast gets to work.
Fermentation Schedule
This is where we give the beer the conditions it needs to develop that clean, refreshing character.
Active Fermentation
Maintain approximately:
65–66°F (18.3–18.9°C)
Try to keep the temperature steady during the most active part of fermentation.
For a beer this light, fermentation-related off-flavours have nowhere to hide.
There’s no giant roast character or massive dry-hop addition covering them up.
Good temperature control matters.
Toward the End of Fermentation
As fermentation slows, allow the temperature to gradually rise to approximately:
67–68°F (19.4–20°C)
This gives the yeast an opportunity to finish working and clean up fermentation byproducts.
Plan on roughly 14 days of fermentation, but don’t package the beer just because the calendar says it’s time.
Take gravity readings.
Once the gravity is stable, fermentation is complete.
Our calculated final gravity is approximately:
FG: 1.007
Your actual final gravity may differ.
And if you’re wondering why I don’t rush beers out of the fermenter, here’s my guide.
Cold-Conditioning the Kölsch
One of the things that makes a Kölsch-style beer so enjoyable is its clean, polished finish.
Cold conditioning helps.
After fermentation is complete, lower the beer temperature to approximately:
34–36°F (1–2°C)
Hold it cold for around two to three weeks.
This gives yeast and other particles more time to settle and helps improve clarity.
It’s also a chance for the beer to smooth out before serving.
Remember, we’re not brewing a traditional lager here.
We’re brewing an ale and giving it a period of cold conditioning.
There’s no need to transfer to a secondary fermenter just for the sake of it. If your setup allows, keep oxygen exposure to a minimum.
Kegging or Bottling
This beer should have a nice, lively carbonation level.
The target is:
Approximately 2.5 volumes of CO₂
If You’re Kegging
Transfer the finished beer into a clean, sanitized keg while minimizing oxygen exposure.
Carbonate to approximately 2.5 volumes of CO₂ using the appropriate pressure for your serving temperature.
Allow the beer time to carbonate completely before judging the finished result.
If You’re Bottling
Make sure fermentation is completely finished before bottling.
Calculate the correct amount of priming sugar based on your actual beer volume, beer temperature, and target carbonation level.
Bottle in properly cleaned and sanitized bottles, then allow enough time for carbonation to develop.
Don’t guess your priming sugar amount.
There’s a big difference between a nicely carbonated Kölsch and a beer that turns into a foam fountain.
How to Keep a 4% Beer From Tasting Watery
This was one of the main things I considered when putting the recipe together.
It’s easy enough to make a lower-alcohol beer.
Making one that still tastes good is where the actual recipe design matters.
Here are the three things I’m relying on.
1. A Balanced Grain Bill
The Pilsner malt provides the foundation.
The Cologne malt brings additional bread-like malt flavour.
And the wheat malt supports the head and mouthfeel.
It’s a straightforward combination, but each grain has a purpose.
2. A Moderate Mash Temperature
We’re mashing at 152°F.
That’s intentional.
I want a reasonably crisp finish, but I don’t want to push fermentability so far that the beer loses too much body.
3. Enough Hop Bitterness to Balance the Malt
At 27.54 IBU, this beer should have a noticeable but restrained bitterness.
There’s enough there to balance the grain without turning the beer into a pale ale.
Of course, the final balance will depend on your actual gravity, fermentation results, and hop alpha acids.
Can You Make Ingredient Substitutions?
Yes, but remember that substitutions can change the finished beer.
If you can’t find Weyermann Cologne Malt, you could build a similar light, bready malt profile using an appropriate alternative base malt blend. However, the exact quantities and recipe statistics would need to be recalculated.
If you can’t find Hallertau Mittelfrüh, look for another suitable German noble-type hop, and recalculate the additions.
And while K-97 is the yeast selected for this recipe, other yeast choices will change the fermentation profile and possibly the final gravity.
The recipe as written uses the specific ingredients above.
That’s what the calculated specifications are based on.
Common Mistakes to Avoid
Letting fermentation temperatures climb too high
A delicate beer benefits from a controlled fermentation. Keep the yeast within your planned range rather than letting the fermenter get away from you.
Using the wrong hop alpha acid percentage
Our calculated 27.54 IBU assumes Hallertau Mittelfrüh at 4.4% alpha acid.
If your hops differ, the bitterness calculation changes.
Rushing the beer into the keg
This style benefits from cold conditioning. Give it a chance to clear and develop a smooth finish.
Missing your target gravity and ignoring it
A lower or higher original gravity changes the beer.
Take readings and use them to understand your brewing efficiency.
Adding unnecessary ingredients
You don’t need fruit, spices, sugar, or a giant dry-hop addition to make this recipe interesting.
We’re aiming for a simple, balanced German-inspired beer.
Sometimes less really is more.
Watch Me Brew This 4% Session Kölsch
[YouTube brewing video coming soon]
I’ll be brewing this recipe on my BrewZilla and sharing the process through Make Beer Easy.
Once we’ve got the finished beer ready, we’ll see how closely it matches the clean, crisp, easy-drinking character we’re aiming for.
Frequently Asked Questions
Is this a traditional Kölsch recipe?
It’s inspired by the traditional Kölsch style, but we’ve deliberately reduced the alcohol content to approximately 4%.
That puts it below the typical strength of a classic Kölsch, so I’m calling it a session Kölsch-style ale.
What makes Kölsch different from a lager?
Kölsch is traditionally brewed with ale yeast, generally fermented relatively cool, and cold-conditioned afterward.
That combination helps produce a clean, lager-like drinking experience while still being an ale.
Why use Cologne malt?
Cologne malt adds some gentle bready malt character to the beer.
For this recipe, it helps create flavour and interest without needing caramel malt or other heavier additions.
Can I brew this without a BrewZilla?
Absolutely.
The recipe can be adapted to another all-grain system, including a traditional mash tun or brew-in-a-bag setup.
Just calculate your water volumes and efficiency for your own equipment.
Can I skip the cold-conditioning stage?
You can package the beer once fermentation is complete, but cold conditioning should help it clear and develop the clean finish we’re aiming for.
For this recipe, I’d give it the full two to three weeks if possible.
Will this beer taste watery at 4%?
That’s what we’re trying to avoid.
The grain bill, mash temperature, and hop balance were selected to create a light, refreshing beer with enough flavour and body to remain enjoyable.
The finished result will depend on how the brew and fermentation actually perform.
Can I make this beer stronger?
Yes.
You could adjust the grain bill to target a higher original gravity, but you’d need to recalculate the recipe and consider how the additional alcohol changes the balance.
This particular version is intentionally built around approximately 4% ABV.
What temperature should I serve this beer?
Serve it nicely chilled, around 38–45°F (3–7°C), according to your preference.
Cold enough to be refreshing, but not so cold that you lose every bit of the malt and hop character.
Continue Learning
Want to improve your all-grain brewing and get more consistent results?
Here are a few Make Beer Easy guides worth checking out:
- 👉 All Grain Brewing Instructions
- 👉 What Is a Mash Out?
- 👉 How Long to Ferment Beer
- 👉 How to Substitute Brewing Ingredients
Looking for Brewing Equipment?
If you’re getting into all-grain brewing or want to improve your current setup, I’ve organized my recommended brewing equipment by category.
You’ll find all-grain systems, brewing accessories, fermenters, temperature-control gear, measuring equipment, and more.
👉 Visit My Beer Brewing Equipment Hub
You don’t need every gadget on the market.
Get the gear that makes brewing easier and helps you make better beer.
Get My Free Brewing Resources
Want to make better beer without making things complicated?
Join my Beginner Brewing Bootcamp! I’ll help you get started, avoid common mistakes, and brew better beer.
👉 Get My Beginner Brewing Bootcamp
Want some great beer recipes to try?
I’ll send you my Top 5 Best-Selling Brew Pub Recipes as my gift to you.
👉 Get My Top 5 Best-Selling Brew Pub Recipes
Both offers are free. Sign up for whichever interests you—or grab both!
Final Thoughts on My 4% Session Kölsch
I really like the idea behind this recipe.
We sometimes get so caught up in brewing bigger, stronger, more complicated beers that we forget how enjoyable a simple, well-made beer can be.
This four-percent Kölsch is about keeping things easy.
A light malt bill.
A traditional German hop.
A suitable ale yeast.
Controlled fermentation.
And enough cold-conditioning time to give us that clean, refreshing finish.
Nothing flashy.
Just a beer you can enjoy drinking.
And a big thanks to @AndresAcebalDominguez for the original suggestion. You asked for a 3.5% Kölsch, and I took the liberty of bumping it up to 4%.
If you brew this one, let me know how yours turns out.
And here’s a question for you:
What’s your favourite beer style to brew at around 4% ABV?
Drop it in the comments. I’m always looking for interesting recipes to try.
Cheers!
Big Robb
Make Beer Easy
Simple Brewing. Better Beer. Made Easy.