Cold brew is coffee extracted with cold water — no heat, ever. Coarsely ground coffee sits in room-temperature or fridge-cold water for 12 to 24 hours, and the result is a drink that’s less acidic, naturally sweeter, and smoother than anything made hot. It isn’t the same as “iced coffee”: that’s just hot coffee poured over ice. Cold brew is a different extraction method entirely, and it produces a genuinely different cup.
You don’t need expensive equipment to make it. A glass jar, coarse-ground coffee, and patience are all it takes.
What You Need for Cold Brew at Home
- Coarsely ground coffee: the grind should look like coarse sea salt. Too fine and you’ll get a bitter, cloudy brew. Any good-quality Colombian coffee works well here.
- Cold filtered water: don’t use unfiltered tap water — minerals and chlorine affect the flavor.
- A glass container: a pitcher, a mason jar, or even a French press all work.
- A filter: a fine-mesh strainer, a cloth filter, or a paper filter to separate the grounds at the end.
Step by Step: How to Make Cold Brew
- Measure the coffee: use a 1:8 ratio (1 gram of coffee per 8 ml of water) for a concentrate, or 1:15 to drink it straight. For one liter of ready-to-drink cold brew, you need about 65 grams (roughly 2.3 oz) of coffee.
- Grind coarse: the grounds should look like coarse sand or sea salt. No grinder? Ask your coffee shop to grind it for French press — that works the same way.
- Mix and wait: combine the coffee and cold water in your container. Stir gently to make sure all the grounds get wet, cover, and put it in the fridge.
- Steep time: 12 hours minimum, 24 hours maximum. Most coffees hit their sweet spot between 16 and 18 hours. More time doesn’t mean more flavor — it means more bitterness.
- Filter: strain the liquid through your filter. If you used the 1:8 concentrate ratio, dilute it with water or milk before serving. If you used 1:15, it’s ready to drink as is.
- Store: cold brew keeps well in the fridge for up to 7 days without losing much flavor.
Cold Brew vs. Iced Coffee: The Real Difference
| Aspect | Cold Brew | Iced Coffee |
|---|---|---|
| Extraction | 12-24 hours in cold water | Hot coffee poured over ice |
| Acidity | Up to 67% less acidic | Same acidity as hot coffee |
| Flavor | Smooth, sweet, chocolate, nutty notes | Can taste watered-down as ice melts |
| Body | Silky and dense | Lighter (diluted) |
| Prep time | 12-24 hours | 5 minutes |
| Shelf life | Up to 7 days refrigerated | Drink immediately |
The difference isn’t just temperature — it’s chemistry. Cold extraction pulls out less chlorogenic acid, so the cup is gentler on the stomach and has a natural sweetness that hot-brewed coffee doesn’t have.
What Coffee Should You Use for Cold Brew?
Cold brew works with almost any coffee, but some origins shine more than others when brewed cold:
- Medium-roast Colombian coffee: chocolate and caramel notes come through more with slow extraction. A coffee from Huila or Nariño works especially well.
- Brazilian coffees: naturally sweet with low acidity, which pairs perfectly with cold brew.
- African coffees (Ethiopia, Kenya): produce a fruity, interesting cold brew, though some of the acidic complexity gets lost.
Avoid very dark roasts. Cold brew already pulls a lot of body from the long steep time, and a dark roast can push the cup into overly bitter territory.
Cold Brew Variations to Try
- Cold brew with milk: 1:8 concentrate plus cold whole milk or almond milk. The creamy base of cold brew makes it a natural match.
- Cold brew tonic: 1 part concentrate plus 2 parts tonic water plus ice. Refreshing, with a surprising citrus edge.
- Vanilla cold brew: drop a vanilla bean (or a splash of natural extract) into the container during the steep. Tastes great as a dessert-style drink.
- Japanese iced coffee: if you don’t want to wait 12 hours, brew hot coffee directly over ice (half the water hot, the rest as ice). It isn’t cold brew, but it gives you a cold cup with more acidity and aroma.
The Science of Cold Brew: Why It Tastes Different
The flavor difference between cold brew and hot coffee isn’t just perception — there’s real chemistry behind it. When hot water hits coffee grounds, it quickly pulls out chlorogenic acids and bitter compounds. Cold extraction, being slower and at a lower temperature, pulls out fewer of those compounds and more soluble sugars and oils.
Studies have measured up to 67% less chlorogenic acid in cold brew compared to hot-brewed coffee. That’s why people with sensitive stomachs often tolerate it better — it isn’t the coffee that bothers them, it’s the acidity from hot extraction.
Oxidation plays a role too. Hot coffee oxidizes quickly on contact with air and loses flavor within 30 minutes. Cold brew, never having been heated, oxidizes much more slowly — which is why it holds up in the fridge for up to 7 days without a noticeable drop in quality.
Specialized Cold Brew Equipment
A glass jar is enough to get started, but a few tools make the process cleaner and more consistent:
- Toddy Cold Brew System: the classic reference. Includes a container, a reusable felt filter, and a glass carafe. Produces a very clean cold brew with minimal sediment.
- Hario Mizudashi: a Japanese pitcher with a built-in mesh filter. Compact and easy to clean — good for smaller fridges.
- Cloth filter: a traditional option that produces a fuller-bodied cold brew than paper filters. If you already own a French press, you can use it as your steeping vessel — the metal mesh filters out the grounds at the end.
- Cold drip tower (Kyoto-style): for the truly obsessive. Drips cold water over coffee for 3-12 hours, producing a more delicate, layered cup.
If you’re just starting out, don’t invest in specialized gear. A mason jar and a mesh filter are all you need. After three or four batches you’ll know whether you want to go further or you’re happy where you are.
FAQs
Does cold brew have more caffeine than hot coffee?
It depends on the ratio. The concentrate (1:8) has more caffeine per ml than a regular cup, but diluted to 1:15, the caffeine content is similar to — or even lower than — a shot of espresso. For the actual numbers by brew method, see our caffeine by cup and brew method breakdown.
Can I make cold brew with store-bought ground coffee?
Yes, but make sure it’s coarsely ground. If it’s already fine (drip-style), the result will be bitter and cloudy. It’s better to buy whole beans and ask for a coarse grind.
How long does cold brew last in the fridge?
Up to 7 days in a sealed container. After that, the flavor starts to flatten out and loses sweetness.
Do I need a special cold brew maker?
No. A lidded glass jar and a mesh or cloth filter are enough. Dedicated cold brew pitchers are convenient, not necessary.
Leer en español: Cómo Hacer Cold Brew en Casa.