Miles SinclairBy Miles Sinclair

Updated November 2026

Cold brew coffee using a French press is one of the easiest ways to make smooth, low-acid coffee at home. You steep coarse grounds in cold water for 12 to 16 hours, then press and strain them out. The result is a concentrate you can dilute and serve over ice, with no heat and no special equipment beyond a standard press.

What You Need Before You Start

Gather a few basics before you measure anything. Most of the work is in the timing and the grind, so the list stays short.

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

  • A French press with a capacity of at least 1 liter (about 34 ounces)
  • Coarse-ground coffee, roughly the texture of raw sugar or sea salt
  • Cold, filtered water
  • A kitchen scale and a timer
  • A fine-mesh strainer or a paper filter for a second pass (optional)

How to Brew Cold Brew Coffee in a French Press

Step 1: Measure and grind

Use a 1:8 coffee-to-water ratio by weight as a starting point. For 1 liter of water, that means about 125 grams of coffee. Grind the beans coarse, because fine particles will over-extract and turn bitter, and they will clog the press screen when you plunge.

Step 2: Combine and stir

Add the grounds to the French press, then pour in the cold water. Stir gently with a spoon for about 10 seconds so every particle gets wet. Some grounds will float, and that is normal. Place the lid on the press but do not push the plunger down yet.

Step 3: Steep in the fridge or on the counter

Let the mixture steep for 12 to 16 hours. A refrigerator gives a cleaner, slightly brighter cup and slows extraction. Steeping at room temperature is faster, usually 8 to 12 hours, but it can taste muddier and should not go much longer, since warm conditions invite spoilage.

Step 4: Press and strain

Press the plunger slowly and evenly. Pour the concentrate into a clean jar. For a clearer result, pour it through a fine-mesh strainer lined with a paper filter. This removes the silt that a press screen alone leaves behind.

Step 5: Dilute and serve

Cold brew concentrate is strong, so dilute it before drinking. A common mix is one part concentrate to one or two parts water or milk, adjusted to taste. Serve over ice. The concentrate keeps in the refrigerator for about one week when sealed.

Factors That Affect Flavor

Three variables do most of the work. Change one at a time so you can tell what caused a difference.

Variable Starting point Effect of changing it
Grind size Coarse Finer grounds increase strength and bitterness
Steep time 12 to 16 hours Longer steeps add body and can add harshness
Ratio 1:8 by weight More coffee makes a stronger concentrate

If your brew tastes flat, try a slightly longer steep or a finer grind. If it tastes harsh or woody, shorten the steep or go coarser. For a deeper look at ratios, see French Press Coffee Ratio: 3 Best Picks for Perfect Brews.

Common Mistakes to Avoid

  • Using fine or medium grounds, which over-extract and make the cup bitter.
  • Steeping at room temperature for longer than 12 hours, which can taste sour or off.
  • Skipping the second strain, which leaves sediment at the bottom of your glass.
  • Drinking the concentrate straight, which is too strong for most palates.
  • Using tap water with heavy chlorine or mineral taste, which carries through to the cup.

A larger press makes it easier to steep a full batch at once, and a fine-mesh strainer helps you get a clearer concentrate.

  • Bodum French press coffee maker: a widely available press that works well for steeping a full liter batch. View on Amazon
  • Fine-mesh stainless steel strainer: catches the fine particles that a press screen can miss. View on Amazon
  • Digital kitchen scale: makes it simple to hit the same coffee-to-water ratio every time. View on Amazon

FAQ

Can I use regular ground coffee for cold brew in a French press?

You can, but the result will be over-extracted and bitter, and the fine grounds may slip past the screen. Coarse grounds give a cleaner, smoother cup. Ask your roaster or grinder for a coarse setting if you are unsure.

How long does cold brew concentrate last?

Sealed and refrigerated, cold brew concentrate typically keeps for about one week. Diluted coffee should be finished within a day or two for the best flavor.

Is cold brew lower in acid than hot coffee?

Many people find cold brew tastes smoother and less acidic, because cold water extracts fewer acidic compounds. If you have acid sensitivity or a medical condition affecting your stomach, check with your doctor before changing your coffee habits.

Conclusion

Cold brew coffee using a French press comes down to coarse grounds, a steady ratio and patient steeping. Start with 1:8 by weight and 12 to 16 hours in the fridge, then adjust one variable at a time. Once you find your favorite balance, the method is easy 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.