Miles SinclairBy Miles Sinclair

Updated November 2026

Cold brew using a French press is one of the easiest ways to make smooth, low-acid coffee at home. You steep coarsely ground coffee in cold water for 12 to 18 hours, press the grounds down, and pour over ice. The result is a concentrate you can dilute to taste and keep in the fridge for several days.

What You Need Before You Start

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

Shopping for one? See our guide: Cold Brew Coffee French Press: 7 Best Picks Compared (2026).

  • A French press with at least a 1-liter capacity
  • Coarsely ground coffee, roughly the texture of sea salt or coarse sand
  • Filtered water at room temperature or cold
  • A digital scale and a kitchen timer
  • A fine-mesh strainer or cheesecloth for a second filtration, if you want an extra-clean cup

How to Make Cold Brew in a French Press

Most home brewers start with a 1:8 coffee-to-water ratio by weight. For a 1-liter press, that means about 110 grams of coffee and 880 grams of water. Adjust from there once you know how you like it.

Step 1: Grind Coarsely

Set your grinder to its coarsest setting. Fine grounds will pass through the press filter, leave sediment in your cup, and can make the brew taste muddy or bitter. If you buy pre-ground coffee, look for a bag labeled for French press or coarse grind. The guide Top 6 French Press Coarse Grind Coffees Compared (2026) covers options that work well for this method. A related read: Coffee Brewing Methods Step by Step: Drip, Pour Over, French Press, Espresso and Cold Brew.

Step 2: Combine Coffee and Water

Add the grounds to the French press carafe, then pour in the cold water. Stir gently with a spoon or wooden paddle until every grain is wet. Dry pockets left at the surface will extract unevenly.

Step 3: Steep at Room Temperature or in the Fridge

Place the lid on the press, but leave the plunger raised so it sits above the grounds without pressing. Steep for 12 to 18 hours. Room temperature brews extract faster, so a 12-hour steep is usually enough. Refrigerated brews develop flavor more slowly and often benefit from the full 18 hours. Taste a small sample at 12 hours if you are unsure.

Step 4: Press and Strain

Press the plunger down slowly and steadily. Pouring the concentrate out right away keeps the grounds from over-extracting in the bottom of the carafe. For a cleaner cup, pour the liquid through a fine-mesh strainer or cheesecloth as a second filter.

Step 5: Dilute and Serve

Cold brew concentrate is strong. Mix one part concentrate with one to two parts cold water or milk, then add ice. Store leftover concentrate in a sealed container in the refrigerator, where it keeps well for about one week.

Common Mistakes to Avoid

  • Grinding too fine. This is the most common cause of gritty, bitter results.
  • Steeping too long. Going well past 18 hours can pull out woody, astringent flavors.
  • Pressing too hard. Forcing the plunger stirs up fines and clouds the brew.
  • Using too little coffee. A weak ratio tastes flat once you add ice and milk.
  • Leaving the concentrate in the press. Pour it into a separate container so it does not keep extracting.

A digital kitchen scale helps you repeat your ratio exactly, which matters more with cold brew than most methods. Search for View on Amazon to find options that measure in grams.

A large borosilicate or stainless French press makes it easier to steep a full batch and pour off concentrate without spilling. Browse View on Amazon for sizes that suit a week of cold brew.

FAQ

Can I make cold brew in a French press without a fridge?

Yes. Steep at room temperature for 12 hours, which is typically enough for a balanced flavor. Keep the press out of direct sunlight to limit off flavors.

How long does French press cold brew last?

Concentrate stored in a sealed container in the refrigerator generally stays fresh for about one week. Diluted coffee is best consumed within a day or two.

Why does my cold brew taste sour or flat?

Sourness often comes from under-extraction, usually from a grind that is too coarse, too short a steep, or too little coffee. Try a slightly finer grind or a longer steep before changing anything else.

Conclusion

Cold brew using a French press needs only coarse coffee, cold water, and patience. Start with a 1:8 ratio and a 12 to 18 hour steep, then adjust grind and time to suit your taste. Once you have the basics, the method is simple enough to repeat every week.

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Miles Sinclair

About Miles Sinclair

Miles Sinclair is part of our editorial team and reviews and edits our coffee beans & brewing methods guides, checking product details against manufacturer specifications and owner feedback.