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This cold brew coffee making guide walks you through the full process: choosing coffee and water, setting the grind and ratio, steeping, straining and storing. Cold brew is coffee steeped in cool or room-temperature water for many hours instead of being brewed with hot water. The result is a smooth, low-acid concentrate or ready-to-drink coffee that keeps for several days in the refrigerator. You need very little equipment, and once you have a ratio you like, the method is easy to repeat.

What You Need Before You Start

Cold brew is forgiving, but a few basics make a big difference. Gather these before you measure anything:

  • Whole coffee beans roasted within the last few weeks, preferably a medium or medium-dark roast. Lighter roasts can taste sharp when cold, and very dark roasts can taste flat or ashy.
  • A burr grinder that produces a coarse, even grind. Blade grinders create dust and uneven pieces, which over-extract and muddy the cup.
  • A kitchen scale that reads in grams. Cold brew depends on ratio, and volume measurements vary too much from batch to batch.
  • Filtered water at room temperature or cold from the tap, depending on your water quality.
  • A steeping vessel, such as a large glass jar, pitcher, or a dedicated cold brew maker.
  • A straining setup, such as paper filters, a fine-mesh strainer lined with cloth, or the filter built into your brewer.
  • Airtight storage, like a glass bottle or pitcher with a lid, for the finished concentrate.

If you are still deciding how to measure, the article on Coffee Scales: Why Weighing Coffee Helps explains why weight beats scoops, and Home Coffee Equipment: What You Need and What Can Wait covers which tools are worth buying first.

Choose Your Ratio and Grind

Ratio and grind size control how strong your cold brew tastes and how much it extracts. Both should be set before you start steeping.

Coffee-to-water ratio

For a ready-to-drink cold brew, a common starting point is 1:8 by weight, meaning 1 gram of coffee for every 8 grams of water. For example, 85 g of coffee and 680 g of water gives you about 765 g of brew, which yields roughly 3 cups once you account for ice and dilution. Some people prefer a concentrate at 1:4 to 1:5, which they dilute with water, milk, or ice after steeping. A concentrate lets you stretch a batch further, but it is also easier to over-dilute into something weak.

Start with 1:8 and adjust by 10 to 15 percent in either direction. If the brew tastes thin, use more coffee next time. If it tastes harsh or woody, try slightly less coffee or a shorter steep. For more on ratios across methods, see Coffee-to-Water Ratios: Measuring for Each Method.

Grind size

Cold brew needs a coarse grind, close to the texture of coarse sea salt or rough breadcrumbs. A finer grind extracts faster and more heavily, and it also clogs filters and makes the final cup silty. Because cold brew steeps for hours, a coarse particle gives you enough extraction without pulling out bitterness.

If your grinder has numbered settings, begin at the coarsest setting that still produces some fine particles and adjust from there. The guide Coffee Grind Size by Brew Method: A Practical Chart lists how grind size shifts across methods, and Electric Coffee Grinders: Burr vs Blade and Settings explains why burr grinders give more consistent results.

Step-by-Step Cold Brew Coffee Making Guide

Work through these steps in order. The whole process takes about 5 minutes of hands-on time, plus a long wait.

Step 1: Grind the coffee

Weigh your beans, then grind them immediately before steeping. Ground coffee loses aroma quickly, and a fresh grind keeps the flavor brighter. Aim for a uniform coarse grind with few fines. If you see a lot of dust at the bottom of the grounds, your grinder may need a coarser setting or a cleaning.

Step 2: Combine coffee and water

Place the grounds in your vessel and pour in the water all at once. Stir gently with a spoon or paddle until every particle is wet. Dry pockets extract unevenly, and stirring at the start helps the grounds settle into an even bed. Cover the vessel loosely.

Step 3: Steep

Steep for 12 to 18 hours at room temperature, or 18 to 24 hours in the refrigerator. Cold water extracts more slowly, so the fridge needs more time. Longer steeps at room temperature can taste sour or stale, and the fridge is the safer choice for longer waits. Keep the container covered and away from direct sun.

Many people taste the brew at 12 hours and decide whether to keep going. Pull a small sample with a clean spoon. If it tastes flat, give it a few more hours. If it tastes woody or sharp, strain it sooner next time.

Step 4: Strain

Strain the concentrate through a paper filter, a cloth-lined fine-mesh strainer, or the built-in filter on a brewer. Strain slowly to avoid pushing fines through. Some people strain twice: once through a coarse mesh to remove grounds, then through a paper filter to clear the sediment. A clearer concentrate tastes cleaner and stays bright longer. The article on Coffee Filters: Paper, Metal and Cloth Compared describes how each filter type affects body and clarity.

Step 5: Dilute and serve

Dilute the concentrate to taste. Many people start with a 1:1 mix of concentrate and water over ice, then adjust. You can also use milk, oat milk, or a splash of cream. Taste before adding sugar or syrup, since cold brew often tastes sweeter than hot coffee.

Step 6: Store

Transfer the finished concentrate to a clean, airtight container and refrigerate it. Properly stored concentrate usually keeps for about one to two weeks, though flavor fades over time. Diluted cold brew is best within a day or two. Label the container with the date you started steeping so you can track batches.

Cold Brew Methods Compared

The steps above describe the most common home approach, the immersion method. Other setups change the workflow but use the same basic principles. The table below summarizes typical settings. Treat the numbers as starting points, not rules.

Method Typical ratio Typical steep or drip time Best for
Immersion in a jar or pitcher 1:8 ready-to-drink, or 1:4 to 1:5 concentrate 12 to 18 hours at room temperature, 18 to 24 hours refrigerated Simple batches, beginners
Cold brew maker with built-in filter Follow the maker’s instructions Usually similar to immersion, per manufacturer guidance Easier straining and cleanup
French press steep About 1:8 to 1:10 12 to 18 hours, plunge and pour Using equipment you already own
Cold drip (Kyoto-style) Often 1:5 to 1:8 concentrate, depending on the setup Several hours of slow drip Very clean, delicate cups; more equipment and attention

If you are comparing dedicated brewers, Best Cold Brew Makers for Home: 3 Cold Brew Makers Compared looks at how the designs differ. For a broader look at brewing styles, Coffee Brewing Methods Compared: Ratios, Grind and Time puts cold brew next to hot methods.

Common Mistakes to Avoid

  • Grinding too fine. This is the most frequent problem. Fine grounds over-extract, clog filters, and leave a muddy, bitter cup. Move to a coarser setting.
  • Using the wrong ratio. Eyeballing scoops leads to inconsistent batches. Weigh your coffee and water every time.
  • Steeping too long at room temperature. Long room-temperature steeps can taste sour or off. Refrigerate the brew if you want a longer wait.
  • Skipping the second strain. Sediment keeps extracting in the bottle and makes the coffee cloudy and gritty over time.
  • Diluting too early or too much. Dilute only what you plan to drink. Adding water to the whole batch shortens shelf life and weakens the flavor.
  • Using stale beans. Old coffee tastes flat when cold. Buy beans with a roast date and store them well. How to Store Coffee Beans So They Stay Fresh covers storage in more detail.
  • Ignoring water quality. Chlorinated or heavily mineralized water can flatten or distort flavor. The article on Water for Coffee: Quality, Filtering and Temperature explains what to look for.

Tips for a Better Cup

  • Keep a simple log with the coffee weight, water weight, grind setting, steep time, and your tasting notes. Small changes become easy to track.
  • Change one variable at a time. If you change the grind and the ratio together, you will not know which one made the difference.
  • Try a blend or a single origin with chocolate or nutty notes for a classic cold brew profile. Fruity, light roasts can be striking too, but they need more careful dilution.
  • Use ice made from filtered water so the ice does not dilute the flavor with off-tastes.
  • If your cold brew tastes weak after dilution, make the concentrate stronger rather than adding more coffee to the glass.

If your results are still off after a few batches, Coffee Brewing Troubleshooting: Fix Bitter or Weak Coffee lists common causes and fixes.

  • A digital kitchen scale. A scale that reads in grams makes ratios repeatable and takes the guesswork out of every batch. Check price on Amazon
  • A burr grinder. Burr grinders produce the even coarse grind cold brew needs, and many models offer enough settings to dial in the grind. Check price on Amazon
  • A glass cold brew pitcher with a filter. A purpose-built pitcher with a removable filter simplifies straining and keeps the concentrate contained in the fridge. Check price on Amazon

FAQ

How long should cold brew steep?

Steep 12 to 18 hours at room temperature or 18 to 24 hours in the refrigerator. Taste a small sample partway through to decide when to strain. Cooler temperatures extract more slowly, so the fridge needs more time.

Can I make cold brew with regular ground coffee?

You can, but results are usually better with freshly ground beans. Pre-ground coffee is often too fine for cold brew, which can make the brew cloudy and bitter. If you use pre-ground coffee, choose the coarsest grind available and strain carefully.

How long does cold brew last in the fridge?

Concentrate stored in an airtight container usually keeps for about one to two weeks, though flavor declines over time. Once diluted with milk or water, drink it within a day or two.

Why does my cold brew taste sour?

Sourness often comes from steeping too long at room temperature, using beans that are very light or stale, or grinding too coarsely for your steep time. Try refrigerating the steep, using a slightly darker roast, or grinding a little finer.

Is cold brew stronger than hot coffee?

It depends on the ratio. Cold brew concentrate is often much stronger than hot coffee because it is made with more coffee relative to water, but once diluted, a glass can taste milder than a typical hot cup. Caffeine content varies widely with bean, ratio, and serving size, so check package or maker information if you track intake.