How to Make Iced Coffee with Coffee Grounds

Quick Answer

You can make iced coffee directly from coffee grounds using either a cold-brew method, which steeps coarse grounds in cold water for 12 to 24 hours, or a hot-brew chill method, which brews a concentrated hot shot and cools it rapidly over ice. Both produce a smooth, customizable base you can tailor to your strength and flavor preferences.

What You Need

• Coffee grounds — medium-coarse for cold brew, medium for hot brew
• Cold filtered water
• A jar, French press, or pour-over dripper
• A tall glass filled with ice
• Milk, sweetener, or flavoring of choice

Cold Brew from Grounds

Combine 1 part coarse coffee grounds with 4 parts cold water in a jar. Stir gently, cover, and refrigerate for 12 to 24 hours. Strain through a fine-mesh sieve or cheesecloth, then again through a paper filter if you want a cleaner cup. The result is a concentrate that keeps in the fridge for up to a week.

Hot-Brew Chill Method

Brew a strong cup using a standard drip machine, pour-over, or French press. Use a 1:15 to 1:17 coffee-to-water ratio, adjusting toward the stronger end. Once brewed, pour the hot coffee directly over a full glass of ice — this rapidly cools the coffee and locks in aroma. Drink within a few hours for the best flavor.

Grind Size and Ratio

Grind size matters more than many beginners realize. A too-fine grind in cold brew leads to over-extraction and grittiness; a too-coarse grind in hot brewing produces weak, sour coffee. Medium-coarse works for cold brew, while medium works for hot methods. Tablespoons and scales both work — start with 2 tablespoons of grounds per 6 ounces of water and adjust from there.

Storing and Reusing Grounds

Unused cold-brew concentrate keeps for seven days refrigerated. Do not reuse the same grounds for a second cold brew batch; the flavorful compounds are largely extracted in the first steep. Hot-brewed grounds can be frozen into ice cubes to avoid diluting your next glass.