How to Make Cold Brew Coffee at Home

Cold brew coffee is smoother, less acidic, and naturally sweeter than hot-brewed coffee — and it's surprisingly easy to make at home. The only requirement is patience: it steeps for 12–24 hours. Here's a complete guide.

What Is Cold Brew?

Cold brew is made by steeping coarsely ground coffee in cold or room-temperature water for an extended period (12–24 hours). Unlike iced coffee (which is hot-brewed coffee poured over ice), cold brew is never exposed to heat. The result is a coffee concentrate that's:

• Less acidic: Cold water extracts fewer acidic compounds than hot water — cold brew has up to 67% less acidity than hot-brewed coffee
• Smoother: No bitterness from heat extraction
• Naturally sweeter: The flavor profile emphasizes chocolate and caramel notes
• Highly caffeinated: The concentrate is strong — dilute before drinking

What You'll Need

• Coarsely ground coffee
• Cold or room-temperature filtered water
• Cold brew maker, mason jar, or large pitcher
• Fine mesh strainer or cheesecloth (if not using a dedicated cold brew maker)

The Basic Ratio

1:4 coffee to water for concentrate (dilute 1:1 with water or milk before drinking)
1:8 coffee to water for ready-to-drink (drink straight over ice)

For a 64 oz batch of concentrate: use 1 cup (about 100g) of coarsely ground coffee to 4 cups (32 oz) of water.

Step-by-Step: Making Cold Brew

1. Grind the coffee coarsely — similar to raw sugar or coarse sea salt. A coarse grind prevents over-extraction during the long steep and makes filtering easier.
2. Combine coffee and cold water in your cold brew maker or a large jar. Stir gently to ensure all grounds are saturated.
3. Cover and refrigerate (or leave at room temperature for a shorter steep):
   • Refrigerator: steep for 18–24 hours
   • Room temperature: steep for 12–15 hours (faster extraction at warmer temps)
4. Filter the coffee. Pour through the built-in filter of your cold brew maker, or through a fine mesh strainer lined with cheesecloth into a clean container. Don't press or squeeze the grounds — it makes the coffee bitter.
5. Store in the refrigerator. Cold brew concentrate keeps for up to 2 weeks refrigerated.
6. Serve over ice, diluted 1:1 with water, milk, or oat milk.

Recommended Cold Brew Maker

The County Line Kitchen 64 oz Glass Cold Brew Coffee Maker is a wide-mouth mason jar with a built-in fine mesh filter and a leak-proof lid. The 64 oz capacity makes a generous batch of concentrate, the wide mouth makes it easy to add grounds and clean, and the glass construction doesn't absorb odors or flavors. It doubles as an iced tea pitcher.

Serving Ideas

• Classic cold brew: Concentrate + water over ice (1:1)
• Cold brew latte: Concentrate + oat milk or whole milk over ice
• Sweetened cold brew: Add simple syrup (dissolves better than granulated sugar in cold liquid)
• Cold brew tonic: Concentrate + tonic water over ice — surprisingly refreshing
• Cold brew overnight oats: Use cold brew instead of milk for coffee-flavored oats

Tips for Better Cold Brew

• Use quality beans: Cold brew highlights the natural sweetness and chocolate notes of the bean — a good medium or dark roast works best
• Don't over-steep: More than 24 hours at room temperature or 36 hours in the fridge produces bitter, over-extracted coffee
• Use filtered water: Cold brew is mostly water — quality matters
• Coarse grind is essential: Fine grounds over-extract and make filtering difficult

Cold brew is one of the most rewarding DIY coffee projects — a batch takes 5 minutes of active work and produces 2 weeks of smooth, low-acid coffee. Once you start making it at home, paying café prices for cold brew feels unnecessary.