Brew Guide · 7 min read

How to Make Cold Brew Coffee at Home

Smooth, sweet, and ridiculously easy — cold brew is the most forgiving brew method that exists. Here's how to make it perfectly every time.

What Makes Cold Brew Different

Cold brew isn't just iced coffee. Iced coffee is hot-brewed coffee poured over ice — it has the same acidity and bitterness, just cold. Cold brew uses time instead of heat to extract flavour. The result is a naturally sweeter, smoother, less acidic cup with about 60% less perceived bitterness.

The science is simple: heat accelerates extraction of all compounds — including the bitter, astringent ones. Cold water extracts slowly and selectively, pulling out sugars and smooth chocolate/caramel notes while leaving most of the harsh compounds behind.

Cold Brew
Smooth Low acidity Naturally sweet 12–18 hr brew 67% less bitter
vs
Iced Coffee
Bright Normal acidity Can taste watered-down 3–5 min brew Standard bitterness

Two Recipes: Concentrate vs. Ready-to-Drink

There are two approaches. The concentrate is more versatile — you dilute it to taste, use it for iced lattes, or even cook with it. The ready-to-drink is simpler — brew it, pour it, done.

Recommended

Concentrate

100 gCoffee
500 mlWater
1:5Ratio
16–18 hrSteep

Dilute 1:1 with water or milk when serving. Stays fresh in the fridge for up to 2 weeks. This is the batch-prep method — make it on Sunday, drink all week.

Simpler

Ready-to-Drink

100 gCoffee
800 mlWater
1:8Ratio
12–14 hrSteep

Drink straight over ice — no dilution needed. Best consumed within 5–7 days. Simpler but less versatile than concentrate.

Step-by-Step Method

1
Grind coarse. Think breadcrumbs, not sand. A coarse grind prevents over-extraction during the long steep. If you don't have a grinder, ask your roaster to grind for cold brew.
2
Combine coffee and room-temperature water in a jar, pitcher, or French press. Stir gently to make sure all grounds are saturated. No hot water — ever.
3
Cover and steep. Room temperature for 12–14 hours, or in the fridge for 16–18 hours. Fridge steeping is slower but produces a cleaner, more balanced flavour.
4
Filter. Pour through a fine-mesh sieve, then through a paper filter or cheesecloth for extra clarity. If using a French press, just plunge — but a second paper filtration removes the sludge.
5
Store and serve. Transfer to a sealed container in the fridge. Serve over ice, dilute with water or milk to taste. Concentrate goes 1:1; ready-to-drink goes straight.

Steep Time vs. Flavour

Steep time is the main lever you pull with cold brew. Here's how it maps to flavour:

8 hours
Light, tea-like, under-extracted for most palates
12 hours
Balanced, smooth, good starting point
16 hours
Sweet spot — rich, full body, low bitterness
18 hours
Strong, bold, starting to get bitter
24+ hours
Over-extracted — woody, bitter, astringent

Best Beans for Cold Brew

Cold brew mutes acidity and amplifies sweetness, so your bean choice matters differently here than for hot methods:

  • Medium to dark roasts work best. They have more chocolate, caramel, and nutty flavours that cold brew excels at extracting. Light roasts can taste flat and under-developed in cold brew.
  • Brazilian, Colombian, and Guatemalan beans are classic cold brew choices — naturally sweet, chocolatey, low acidity.
  • Avoid very expensive single-origin light roasts. The delicate floral and fruit notes that make a $25 Ethiopian special in a V60 will be completely lost in cold brew. Save those for pour-over.
  • Pre-ground is fine if you can't grind coarse enough at home. Cold brew is forgiving — just make sure it's coarse.
💡
Cold brew is the perfect entry point. If you've never logged a brew before, cold brew is the easiest place to start — few variables, long time window, and you can taste the difference between beans clearly without worrying about pouring technique or water temperature.