Yes. You can cold brew decaf, you should consider it more often than you do, and in one important way the result is better than the caffeinated version.
Decaf cold brew is made by steeping decaffeinated ground coffee in cold or room temperature water for 12 to 18 hours, then straining out the grounds. The result is a smooth concentrate with around 2 to 7mg of caffeine per 300ml glass. Low enough to drink in the evening without affecting sleep. Same method as regular cold brew, just with decaffeinated beans.
Why decaf works particularly well for cold brew
Three reasons, and the first two compound.
Acidity reduction, twice over. Cold brewing alone reduces total titratable acidity by 28 to 50 percent against the same coffee brewed hot (Fuller & Rao, 2018, Scientific Reports). Decaffeination shaves acidity further: the processing removes some chlorogenic acids alongside the caffeine, so decaf samples generally hit higher pH than their caffeinated equivalents. Combine the two and you get coffee that is gentler on the stomach than any other way of drinking it.
No caffeine ceiling. A glass of cold brew concentrate is usually 200 to 400ml. At caffeinated strength that’s 120 to 200mg of caffeine, at or near the daily limit for most adults in one sitting. Decaf removes the ceiling. Drink a litre at ten in the evening. Flavour is the only constraint.
Cleaner cup at the same origin. Hot brewing extracts bitter compounds (quinic acid in particular) that cold water mostly skips. Decaffeination removes some of the same precursors before the bean is ever brewed. The two effects stack. A good decaf cold brew can taste sweeter and clearer than the caffeinated version of the same coffee.
What to look for in a decaf bean for cold brew
Roast level. Medium to medium dark extracts cleanly in cold water. Light roasts depend on heat to release their aromatics, and those notes go missing in a 14 hour fridge steep. Dark roasts get heavy and flat. Target the middle.
Decaffeination method. All three specialty methods work. The differences are subtle but real.
| Method | Mechanism | Effect on cold brew |
|---|---|---|
| Swiss Water | Water and activated carbon, no solvents | Cleanest extraction, complex flavour preserved |
| CO2 | Supercritical CO2 binds caffeine selectively | Most precise, body and lipids intact |
| Sugar Cane (EA) | Ethyl acetate from fermented cane, beans washed and dried | Slight sweetness, suits natural processed origins |
Avoid methylene chloride decaf, which appears on cheap supermarket SKUs and is the one method specialty roasters refuse to use. Cold brewing exposes a flat bean faster than any other method.
Origin and process. Full bodied, lower acidity origins hold up best: Peru, Brazil, Colombia, parts of Central America. Natural processed lots tend to bring chocolate, caramel, dark fruit, molasses. Those develop in a long cold steep. Bright citrus and delicate florals fade.
The best UK decaf beans for cold brew
Five picks from the Decaffeinate directory, chosen for cold brew suitability: medium to medium dark roast, body, and flavour notes that hold up after 14 hours in the fridge.
Artisan Roast, Decaf Brazil Swiss Water (£9.50)
Artisan Roast’s Brazilian is the cleanest entry point. Natural processed, Swiss Water decaffeinated, with tasting notes of almond, molasses and cocoa. Those are precisely the flavours that develop in cold water rather than fade. The natural process adds a body that washed beans at this price struggle to match.
Assembly Coffee, Decaf Brazil (£12)
Assembly’s Brixton roastery sources this from the Mió farm in Minas Gerais. Sugar Cane EA decaffeinated, natural processed, with sweet nut, chocolate and caramel notes. A creamier cup than the Artisan Roast version, with provenance to match the price step up. Tailor made for an extended cold steep.
Climpson & Sons, Signature Decaf (£10)
Climpson’s Signature is a single origin Huila Colombian, decaffeinated at origin via the sugar cane EA process. Dark chocolate and caramel with a lift of orange rind. That orange note adds brightness to the cold cup without being the kind of delicate floral that disappears. Roasted in London by a Broadway Market roaster trading since 2004.
Balance Coffee, Halcyon Decaf (£14)
Balance’s Halcyon is a CO2 decaffeinated Guatemalan from the Rio Azul cooperative in Huehuetenango. Chocolate, caramel, almond. CO2 is the most precise of the three methods and leaves the flavour chemistry largely intact, which matters in cold brew because there is no heat to mask defects. Balance also lab tests for mould, mycotoxins and pesticides. Most roasters don’t.
Common Coffee, Decaf Roast (£12)
Common Coffee’s Decaf Roast is sourced from Daterra in the Brazilian Cerrado. Swiss Water processed, naturally processed, dried on the tree. Apple, dark chocolate, biscuit. The Daterra estate is the only B Corp certified coffee farm in the world, which gives the bag a traceable origin story most decaf labels can’t match.
Browse the full directory and filter by Decaf Method to find more in the same bracket.
Cold brew ratio and steep time
Two ratios cover most situations.
| Use | Ratio | Coffee | Water |
|---|---|---|---|
| Concentrate (dilute 1:1 before drinking) | 1:4 | 100g | 400ml |
| Ready to drink | 1:8 | 100g | 800ml |
Grind: coarse. Roughly French press, comparable to raw sugar or coarse sea salt. Finer grinds over a long steep produce sediment and over-extracted bitterness.
Steep: 12 to 18 hours in the fridge. Twelve gives a lighter, brighter cup. Eighteen gives more body. Room temperature steeps cut to 8 to 12 hours and produce a brighter result, but warm rooms invite microbial growth over a long brew so the fridge stays the safer default.
Decaf-specific adjustment: in practice, none. Decaffeinated beans are slightly more porous than caffeinated equivalents, which would normally speed extraction. The slow cold steep largely offsets that. Treat ratio and steep time the same.
How to make decaf cold brew at home
- Weigh out your decaf beans and grind coarse, roughly French press
- Add the grounds to a large jar or jug
- Pour cold filtered water over the grounds at your chosen ratio (1:4 concentrate, 1:8 ready to drink)
- Stir to wet every ground
- Cover and place in the fridge
- Steep for 12 to 18 hours
- Strain through a fine mesh sieve, paper filter or cheesecloth
- Decant the concentrate into a sealed jar
A French press doubles as a brewing vessel and filter if you don’t want a separate setup. A Toddy cold brew system is more elegant. Neither is essential.
Storing and serving
Storage. Concentrate keeps 7 to 14 days in a sealed jar in the fridge, longer the better the seal. Diluted ready to drink lasts 5 to 7 days. Do not freeze.
Serving. Dilute the concentrate 1:1 with cold water, milk, oat milk or sparkling water. Or pour it straight over a glass of ice and let the ice do the dilution as it melts. Sparkling water is the most underrated option, particularly in the evening: the carbonation lifts the chocolate notes and turns a glass of decaf cold brew into something close to a coffee soda.
A short note on ready made options. TJ Brews ships a 1 litre Swiss Water decaf cold brew nationally, and Nolo sells decaf cold brew oat lattes in cartons. Both are decent. Neither matches what you can build at home from a specialty roaster bean costing £10 to £14.