How to Make Cold Brew at Home
7 min read
Cold brew is one of the simplest and most forgiving coffee methods — no special equipment, no precise temperature control, and the result is a smooth, naturally sweet concentrate you can enjoy all week. Here is exactly how to make it at home.
What Makes Cold Brew Different
Unlike iced coffee (which is hot-brewed coffee poured over ice), cold brew is never exposed to heat. Ground coffee steeps in cold or room-temperature water for 12–24 hours. This slow extraction pulls sugars and oils from the beans while leaving behind many of the bitter, acidic compounds that dissolve primarily at high temperatures. The result is a concentrate that is 60–70% less acidic than hot coffee, naturally sweeter, and incredibly smooth.
What You Need
The beauty of cold brew is its simplicity. You need coarsely ground coffee (about the texture of raw sugar), filtered water, a jar or pitcher with a lid, and something to strain with — a fine-mesh sieve, cheesecloth, or a French press all work. No thermometer, no gooseneck kettle, no timer precision. A 1-quart mason jar is a perfect beginner vessel.
The Ratio: 1:5 for Concentrate, 1:8 for Ready-to-Drink
For a strong concentrate (meant to be diluted before serving), use 1 part coffee to 5 parts water by weight — for example, 100g coffee to 500g water. For a ready-to-drink cold brew that needs no dilution, use 1:8. Start with the concentrate ratio: it is more versatile, stores better, and lets you adjust strength per glass by adding water, milk, or ice.
Step-by-Step Brewing
Grind your coffee extra coarse — coarser than French press. Combine the grounds and cold filtered water in your container. Stir gently to make sure all grounds are wet. Cover and place in the refrigerator (or leave at room temperature for a slightly faster, more chocolatey extraction). Wait 16–20 hours for the best balance of flavor and smoothness. Strain through a fine-mesh sieve lined with cheesecloth or a paper filter. Store the strained concentrate in the fridge.
Steep Time and Flavor
Under 12 hours produces a weak, under-extracted brew that tastes thin and sour. The sweet spot is 16–20 hours — smooth, full-bodied, with chocolate and caramel notes. Over 24 hours starts extracting bitter, woody, astringent compounds that make the brew harsh. If you prefer a milder cup, dilute more rather than steeping less. Temperature matters too: room-temperature steeping is faster (12–16 hours), while refrigerator steeping takes longer (18–24 hours) but produces a cleaner result.
Best Beans for Cold Brew
Cold brew rewards low-acid, full-bodied beans. Brazilian, Colombian, and Guatemalan coffees work beautifully — look for tasting notes like chocolate, caramel, nuts, and dried fruit. Light-roast, high-acid coffees (like bright Kenyan or floral Ethiopian) can taste flat or oddly muted in cold brew because the cold extraction does not pull their bright acids effectively. Medium to dark roasts are ideal.
Storage and Serving
Strained cold brew concentrate keeps in the refrigerator for up to 2 weeks without significant flavor degradation. Dilute 1:1 with water or milk when serving. Serve over ice, add vanilla syrup, or blend with oat milk for a creamy latte. Cold brew also makes an excellent base for coffee cocktails — try it with bourbon and a splash of simple syrup.