Brew Dunkin’ Style Cold Coffee At Home

Quick answer

• Use a coarse grind for your coffee beans.
• Steep your coffee grounds in cold water for 12-24 hours.
• Filter out the grounds thoroughly.
• Dilute the concentrate with water or milk to your liking.
• Sweeten and add cream if that’s your jam.
• Experiment with different coffee beans to find your favorite flavor.

Who this is for

• Anyone who loves Dunkin’s cold coffee but wants to save a few bucks.
• Busy folks who can set it and forget it for a few hours.
• Coffee drinkers who prefer a smoother, less acidic brew.

What to check first

Brewer type and filter type

Cold brew is pretty forgiving, but you’ve got options. A French press works great. So does a big jar with a fine-mesh strainer. Even a dedicated cold brew maker will do the trick. The key is keeping those grounds from ending up in your cup. Use a filter fine enough to catch them. Paper filters can work, but a metal mesh or cloth filter is often better for cold brew to avoid clogging.

Water quality and temperature

Start with good water. If your tap water tastes funky, your coffee will too. Filtered water is your friend here. And for cold brew, it’s literally in the name: cold water. Room temperature is okay if that’s all you’ve got, but truly cold water from the fridge is ideal for that slow, smooth extraction. Don’t get fancy with hot water; that’s for a different kind of coffee.

Grind size and coffee freshness

This is crucial for cold brew. You want a coarse grind. Think breadcrumbs or even a bit chunkier. Too fine, and you’ll get sludge and over-extraction. Too coarse, and you might not get enough flavor. Freshly ground beans are always best. Grind them right before you brew for the most flavor. Stale coffee just won’t cut it, no matter how you brew it.

Coffee-to-water ratio

This is where you control the strength. For a concentrate, a good starting point is a 1:4 ratio of coffee to water by weight. So, if you use 4 oz of coffee, use 16 oz of water. You can adjust this later. Remember, this makes a concentrate. You’ll dilute it. If you’re not weighing, a common volume ratio is about 1 cup of grounds to 4 cups of water.

Cleanliness/descale status

Give your brewing gear a good scrub. Any old coffee residue can make your fresh brew taste bitter or stale. If you use a machine or a reusable filter, make sure it’s clean. If you’ve got hard water, descaling your equipment regularly is a good idea. It prevents buildup and keeps your coffee tasting pure.

Step-by-step (brew workflow)

1. Measure your coffee beans.

• What “good” looks like: You’ve got your beans ready to grind. For a 1:4 concentrate ratio, aim for about 4 oz of beans for 16 oz of water.
• Common mistake: Guessing the amount. This leads to inconsistent strength.
• How to avoid it: Use a kitchen scale. It’s a game-changer for coffee.

2. Grind your coffee beans.

• What “good” looks like: A coarse, even grind that looks like coarse sea salt or breadcrumbs.
• Common mistake: Using a fine grind like for espresso. This creates muddy coffee.
• How to avoid it: Set your grinder to its coarsest setting or use a burr grinder with a coarse setting.

3. Combine coffee grounds and cold water.

• What “good” looks like: All the grounds are saturated with water. Give it a gentle stir to ensure no dry pockets.
• Common mistake: Not fully saturating the grounds. Some grounds will be left out of the brewing process.
• How to avoid it: Pour the water over the grounds slowly, then give it a gentle stir with a non-metal spoon.

4. Steep the mixture.

• What “good” looks like: The mixture is covered and sitting undisturbed in a cool place, like your fridge or pantry.
• Common mistake: Steeping for too short a time (weak coffee) or too long (bitter coffee).
• How to avoid it: Aim for 12-24 hours. 18 hours is a solid middle ground to start.

5. Prepare for filtering.

• What “good” looks like: Your filter setup is ready to go over a clean container. If using a French press, just have it ready.
• Common mistake: Not having a clean container ready. You don’t want to pour hot, freshly brewed coffee into a dirty vessel.
• How to avoid it: Wash and dry your brewing container and any filters thoroughly before starting.

6. Filter the coffee concentrate.

• What “good” looks like: The liquid is mostly clear, with minimal sediment. It might take a couple of passes or a bit of patience.
• Common mistake: Rushing the filtering process and getting grounds in your final brew.
• How to avoid it: Filter slowly. If using a fine-mesh strainer, line it with cheesecloth or a paper filter for extra clarity. Let gravity do its thing.

7. Discard the spent grounds.

• What “good” looks like: All the coffee grounds are out of your concentrate and ready for composting or disposal.
• Common mistake: Leaving grounds in the concentrate, which can lead to over-extraction and bitterness.
• How to avoid it: Ensure you’ve filtered thoroughly. Some people do a second pass if they’re particular about clarity.

8. Dilute the concentrate.

• What “good” looks like: You have a drinkable cold coffee that tastes smooth and strong, but not overwhelmingly so.
• Common mistake: Drinking the concentrate straight. It’s super strong and will make your teeth hurt.
• How to avoid it: Start with a 1:1 ratio of concentrate to water or milk. Taste and add more liquid until it’s just right for you.

9. Add your favorite additions.

• What “good” looks like: Your coffee is customized to your taste. Sweet, creamy, or black – it’s your call.
• Common mistake: Overdoing the sugar or cream, masking the coffee flavor entirely.
• How to avoid it: Add sweeteners and creamers gradually, tasting as you go.

10. Chill and enjoy.

• What “good” looks like: A refreshing, delicious cup of cold coffee ready to go.
• Common mistake: Not chilling it enough, leading to a lukewarm, unappealing drink.
• How to avoid it: Serve over ice. If you want it colder, let the concentrate chill in the fridge after filtering before diluting.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using a fine coffee grind	Muddy coffee, over-extraction, bitter taste	Use a coarse grind. Think sea salt or breadcrumbs.
Not steeping long enough	Weak, watery coffee	Steep for at least 12 hours, up to 24 hours.
Steeping for too long	Bitter, harsh, over-extracted coffee	Stick to the 12-24 hour window. Taste at 18 hours and adjust.
Not saturating all grounds	Uneven extraction, weak spots in flavor	Stir gently after adding water to ensure all grounds are wet.
Using tap water with bad taste	Off-flavors in your coffee	Use filtered water. Your coffee will thank you.
Not filtering thoroughly	Gritty, muddy coffee	Filter slowly, use a fine-mesh strainer, cheesecloth, or paper filter. A second pass can help.
Drinking the concentrate straight	Extremely strong, unpleasant taste	Always dilute with water, milk, or your preferred liquid. Start with a 1:1 ratio.
Using old, stale coffee beans	Flat, dull, lifeless coffee	Use fresh, whole beans and grind them just before brewing.
Not cleaning your equipment	Stale, off-flavors contaminating your brew	Wash all brewing gear thoroughly after each use.
Using hot water for steeping	This isn’t cold brew anymore!	Stick to cold or room temperature water for the steeping process.

Decision rules (simple if/then)

• If your cold brew tastes bitter, then try a coarser grind or reduce steeping time because over-extraction is likely.
• If your cold brew tastes weak, then try a finer grind (but not too fine!) or increase steeping time because under-extraction is the culprit.
• If you have sediment in your cup, then filter the concentrate again using a finer filter medium because your initial filtering wasn’t thorough enough.
• If you want a stronger coffee flavor without more caffeine, then dilute the concentrate less because you’re essentially adjusting the ratio.
• If you want a less intense coffee flavor, then dilute the concentrate more because you’re making it weaker.
• If your coffee tastes like yesterday’s news, then use fresher beans and grind them right before brewing because freshness is key.
• If your water tastes off, then use filtered water for your brew because bad water makes bad coffee.
• If you’re short on time, then aim for the lower end of the steeping range (around 12 hours) because it’s better than nothing, though flavor might be less developed.
• If you’re using a French press, then be extra careful during the filtering step to avoid pushing fine grounds through the plunger because they can sneak past.
• If you notice a slimy film or mold in your brewing equipment, then clean it thoroughly immediately because that’s a recipe for a nasty-tasting brew.
• If you’re experimenting with different beans, then keep notes on the type of bean and your brewing parameters because it helps you replicate great results.

FAQ

What kind of coffee beans should I use for cold brew?

You can use almost any coffee bean. Medium to dark roasts often yield a richer, smoother flavor profile that pairs well with cold brew. But don’t be afraid to try lighter roasts to see what you get!

How long does cold brew concentrate last?

Stored in an airtight container in the refrigerator, your cold brew concentrate should be good for about 7-10 days. It’s best enjoyed fresh, though.

Can I make cold brew without a special maker?

Absolutely. A simple mason jar, a fine-mesh strainer, and some cheesecloth or a paper filter will get the job done. You can also use a French press.

Why is my cold brew cloudy?

This usually happens if your grind is too fine or if you didn’t filter it thoroughly enough. A second filtering pass can often clear it up.

How much caffeine is in homemade cold brew?

Cold brew typically has more caffeine than hot coffee because of the higher coffee-to-water ratio used for the concentrate. However, the exact amount depends on the beans, the ratio, and how much you dilute it.

Do I have to dilute cold brew?

Yes, unless you want a super-intense, almost syrup-like coffee. Cold brew is made as a concentrate and is meant to be diluted with water, milk, or ice.

What’s the difference between cold brew and iced coffee?

Iced coffee is typically hot-brewed coffee that’s cooled down and served over ice. Cold brew is brewed with cold water over a long period, resulting in a smoother, less acidic taste.

Can I use pre-ground coffee?

You can, but it’s not ideal. Pre-ground coffee is usually too fine for cold brew and loses its freshness quickly. If you must, look for the coarsest grind available.

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

• Specific bean recommendations or flavor profiles (explore coffee blogs for bean reviews).
• Detailed discussions on water chemistry and its impact on coffee extraction (look into advanced brewing guides).
• Comparisons of different types of cold brew makers (check product reviews if you’re considering a specific device).
• Advanced techniques like nitro cold brew or cold foam recipes (search for “DIY nitro cold brew” or “coffee foam recipes”).
• The science behind coffee extraction and oxidation (explore coffee science websites).