Starbucks Cold Brew Concentrate: DIY Guide

Quick answer

• Use a coarse grind for best extraction.
• Steep for 12-24 hours, depending on your preference.
• Use a 1:4 coffee-to-water ratio for concentrate.
• Filter well to remove sediment.
• Store in an airtight container in the fridge.
• Dilute with water or milk to serve.

Who this is for

• You’re a fan of Starbucks cold brew concentrate but want to save a few bucks.
• You like the idea of having cold brew on hand without a daily trip to the coffee shop.
• You’re ready to get a little hands-on with your morning coffee routine.

What to check first

Brewer type and filter type

For DIY cold brew concentrate, you don’t need fancy equipment. A large jar or pitcher works just fine. You’ll need a way to filter out the grounds later, so think about cheesecloth, a fine-mesh sieve, or even a dedicated cold brew maker. A paper filter can be used for an extra clean cup, but it’s not always necessary for concentrate.

For DIY cold brew concentrate, a large glass pitcher is a great starting point for brewing and storing your concentrate.

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Water quality and temperature

Good coffee starts with good water. If your tap water tastes off, your cold brew will too. Filtered water is usually the way to go. Cold brew uses room temperature or cold water, so no need to boil anything. Easy, right?

Grind size and coffee freshness

This is crucial. You want a coarse grind, like breadcrumbs or rock salt. Too fine, and you’ll get a muddy, over-extracted mess. Too coarse, and it might be weak. Freshly ground beans are always best, but for cold brew, even pre-ground coffee can work if it’s a coarse grind.

Coffee-to-water ratio

For concentrate, a good starting point is a 1:4 ratio by weight. That means 1 part coffee to 4 parts water. For example, 8 oz of coffee to 32 oz of water. You can adjust this later based on how strong you like it.

Cleanliness/descale status

Make sure your brewing vessel and any filters are clean. Old coffee oils can make your new batch taste bitter or rancid. If you’re using a machine, give it a quick clean. It’s not rocket science, just common sense.

Step-by-step (brew workflow)

1. Measure your coffee. Grab your favorite coffee beans. Weigh out your coffee.

• What “good” looks like: You have the correct amount of beans for your desired batch size.
• Common mistake: Guessing the amount. Avoid this by using a scale.

2. Grind your coffee. Grind the beans to a coarse consistency.

• What “good” looks like: Grounds resemble coarse sea salt or breadcrumbs.
• Common mistake: Grinding too fine. This leads to bitterness and sediment. Use a burr grinder if you have one.

3. Combine coffee and water. Put the coarse grounds into your brewing container. Add cold, filtered water.

• What “good” looks like: All the grounds are saturated with water.
• Common mistake: Not fully saturating the grounds. Gently stir to ensure everything gets wet.

4. Steep the mixture. Cover the container and let it sit.

• What “good” looks like: The mixture is steeping undisturbed at room temperature or in the fridge.
• Common mistake: Moving it around too much. Let it be.

5. Wait for extraction. Let it steep for 12 to 24 hours. Longer steeping equals stronger flavor.

• What “good” looks like: You’ve reached your desired steeping time. 18 hours is a solid middle ground.
• Common mistake: Steeping too short or too long. Too short is weak, too long can get bitter. Experiment!

6. First filter. Strain the mixture through a fine-mesh sieve lined with cheesecloth.

• What “good” looks like: Most of the grounds are separated from the liquid.
• Common mistake: Rushing this step. Let gravity do its thing.

7. Second filter (optional). For a cleaner concentrate, filter again through a paper coffee filter.

• What “good” looks like: The liquid is much clearer, with minimal sediment.
• Common mistake: Using a clogged filter. You might need to do this in batches.

8. Store the concentrate. Pour the filtered cold brew concentrate into an airtight container.

• What “good” looks like: The container is sealed tight.
• Common mistake: Leaving it exposed. This lets in fridge odors and makes it go stale faster.

9. Chill. Refrigerate the concentrate.

• What “good” looks like: It’s cold and ready to be served.
• Common mistake: Serving it warm. Cold brew is meant to be cold.

10. Dilute and serve. Mix your concentrate with water or milk. A 1:1 ratio is a good start.

• What “good” looks like: You have a perfectly balanced cold coffee drink.
• Common mistake: Not diluting enough. It will be too strong. Taste and adjust.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using a fine grind	Bitter, muddy coffee; difficult to filter	Switch to a coarse grind.
Not enough steeping time	Weak, watery coffee	Increase steeping time by a few hours.
Too much steeping time	Bitter, over-extracted, unpleasant flavor	Reduce steeping time.
Using tap water with bad taste	Off-flavors in your cold brew	Use filtered or bottled water.
Not filtering thoroughly	Gritty, sediment-filled coffee	Filter in stages, use cheesecloth, or a dedicated cold brew filter.
Not storing in an airtight container	Stale flavor, absorbs fridge odors	Use a sealed jar or bottle.
Not diluting the concentrate	Overpoweringly strong, bitter coffee	Dilute with water, milk, or ice. Start with 1:1.
Using stale coffee beans	Flat, dull flavor	Use freshly roasted beans if possible.
Not cleaning equipment	Rancid, bitter taste from old oils	Wash all brewing and filtering gear thoroughly.
Incorrect coffee-to-water ratio	Too weak or too strong concentrate	Measure by weight for consistency. Adjust ratio as needed.

Decision rules (simple if/then)

• If your cold brew tastes weak, then increase the coffee-to-water ratio or steep for longer because under-extraction is the likely cause.
• If your cold brew tastes bitter, then reduce the steeping time or use a coarser grind because over-extraction is the likely cause.
• If you have a lot of sediment, then filter it again using cheesecloth or a paper filter because insufficient filtering is the issue.
• If your concentrate is too strong, then dilute it with more water or milk because that’s the purpose of a concentrate.
• If your water tastes funny, then use filtered water because water quality is key to coffee flavor.
• If you are in a hurry, then this method isn’t for you because cold brew requires significant steeping time.
• If you prefer a lighter body, then filter through a paper filter because it removes more oils and fine particles.
• If you don’t mind a bit of grit, then skip the paper filter step because it’s an extra step that can be omitted.
• If your coffee smells “off” before brewing, then use fresh beans because stale beans make bad coffee.
• If your cold brew tastes sour, then check your grind size and steeping time because it might be under-extracted.

FAQ

How long does Starbucks cold brew concentrate last?

Your homemade concentrate should last about 1-2 weeks when stored properly in an airtight container in the refrigerator. Always check for any off smells or tastes before serving.

Can I use any type of coffee bean?

Yes, you can use most coffee beans. However, medium to dark roasts often yield a smoother, richer flavor profile that works well for cold brew. Experiment to see what you like best!

What’s the difference between cold brew concentrate and regular cold brew?

Concentrate is a more potent version made with a higher coffee-to-water ratio. It’s meant to be diluted before drinking, while regular cold brew is already at drinkable strength.

Do I need a special cold brew maker?

Nope. A simple jar or pitcher and some filtering tools like cheesecloth or a fine-mesh sieve work perfectly well for making concentrate at home.

Why is my cold brew gritty?

This usually happens if the coffee grounds were too fine, or if the filtering process wasn’t thorough enough. Using a coarse grind and filtering multiple times can help.

Can I use hot water to speed up the process?

No. The beauty of cold brew is that it uses cold water, which results in a smoother, less acidic flavor. Hot water will extract differently and defeat the purpose.

How much concentrate should I use per serving?

A good starting point is a 1:1 ratio of concentrate to water or milk. You can adjust this based on your preference for strength. Taste as you go!

What this page does NOT cover (and where to go next)

• Specific Starbucks coffee bean recommendations for cold brew.
• Detailed comparisons of different cold brew maker brands.
• Advanced flavor infusion techniques (like adding spices during brewing).
• Recipes for hot coffee drinks using cold brew concentrate.