Iced coffee and cold brew get lumped together constantly, but they're not the same drink. Iced coffee is hot-brewed coffee cooled down or poured over ice — it keeps the brightness and acidity of a normal cup. Cold brew is steeped in cold or room-temperature water for hours, which pulls flavor out more slowly and leaves out most of the acids and oils that flash-extract at high heat. The result is rounder, sweeter, and noticeably smoother, with a body that holds up to ice and milk without going watery.
Getting there consistently comes down to four variables: ratio, grind size, steep time, and which coffee you start with. Here's what actually moves the needle on each.
The Ratio That Actually Matters
Most home cold brew fails because the ratio is off, not because of anything exotic. For a concentrate you'll dilute later, use roughly 1 part coarsely ground coffee to 4 parts cold, filtered water by weight — about 100g of coffee to 500g (17 oz) of water. That gives you a strong base you can cut with water, milk, or ice without it turning thin.
If you'd rather brew to drinking strength and skip the dilution step, go closer to 1:8 or 1:10. It's a weaker steep, but it's ready to pour straight over ice.
Grind Size Changes Everything
Cold brew needs a coarse grind — think French press, not drip. A finer grind increases the surface area exposed to water for 12+ hours, which over-extracts the coffee and pulls out bitter, muddy notes instead of the sweetness cold brew is known for. Fine grounds also clog filters and leave more sediment in the final cup. If you're grinding whole beans at home, err coarser than you think you need.
Steep Time: Where Most of the Flavor Decisions Happen
Room temperature (around 12–18 hours) extracts faster and gives you more control in a single evening-to-morning window. Refrigerated steeps run slower and typically need 24–36 hours to reach the same strength, but many people find the flavor a touch smoother since extraction happens more gradually.
If your cold brew tastes bitter or harsh, the fix is almost always a shorter steep or a coarser grind — not less coffee. If it tastes thin or watery, extend the steep time before you add more grounds.
Immersion vs. Slow-Drip
Immersion brewing — steeping all the grounds directly in water, then straining — is the easiest method at home and works with nothing more than a large jar and a fine-mesh strainer or cheesecloth. Slow-drip (sometimes called Kyoto-style) drips cold water through the grounds over several hours instead of steeping them all at once. It takes dedicated equipment and more patience, but produces a cleaner, more tea-like cup with less sediment. For most people brewing at home, immersion is the better starting point.
Which Coffee to Use
Our Cold Brew Coffee Blend is formulated for this brew method specifically, so it's the simplest place to start if you want a reliable result without testing variables yourself.
If you want to experiment, roast level and origin both come through in cold brew, just more subtly than in a hot cup. Naturally lower-acid, chocolate-and-nut profiles — like Brazil Santos or Guatemala — tend to feel balanced and easy-drinking as a cold brew. Brighter, fruit-forward coffees like Ethiopia Natural Process mellow out considerably when cold-steeped but still carry a distinct character worth trying if you like a more complex cup. Since every order is roasted to order, grinding your beans right before you brew — rather than buying pre-ground — will give you the most flavor to work with either way.
Not sure where to start? The 6 Coffee Roast Sample Pack is a low-commitment way to run your own side-by-side and find the roast level you like best before buying a full bag.
Diluting and Serving
If you brewed a concentrate, start by cutting it roughly 1:1 with cold water or milk over ice, then adjust from there — some people prefer it stronger, some closer to 1:2. Store leftover concentrate in a sealed container in the refrigerator and use it within a week or two for the best flavor; it will gradually lose brightness the longer it sits.
Quick Troubleshooting
- Tastes bitter or harsh: shorten the steep time or grind coarser.
- Tastes weak or watery: extend the steep time before adding more coffee, and double check you're using a coarse grind rather than a finer one that's under-extracting unevenly.
- Cloudy or gritty in the glass: strain through a finer mesh or add a second pass through a paper filter.
- Flat, one-note flavor: try a different origin — lighter, naturally processed coffees hold onto more complexity in a cold steep than very dark roasts do.
Cold brew rewards a little patience more than it rewards fancy equipment. Get the ratio and grind right, give it enough time, and the coffee does most of the work.