Brewing Cold Brew Coffee Using an AeroPress

Quick Answer

• Use the inverted AeroPress method for best results.
• A coarse grind is key for cold brew.
• Let it steep for at least 12 hours, up to 24.
• Dilute your concentrate to taste.
• Use filtered water for a cleaner cup.
• Clean your AeroPress right after use.

Who This Is For

• AeroPress owners looking for a new way to brew.
• Coffee drinkers who love smooth, low-acid cold brew.
• Anyone who wants a quick, portable cold brew setup.

What to Check First

Brewer Type and Filter Type

You’re using an AeroPress, so that’s set. For cold brew, paper filters work fine, but a metal filter can give you a bit more body. Some folks even use a cloth filter. Just make sure whatever you use is clean.

Water Quality and Temperature

Tap water can mess with your flavor. Filtered water is the way to go. For cold brew, you’re using cold or room temperature water. No need for fancy temps here.

Grind Size and Coffee Freshness

This is a big one for cold brew. You want a coarse grind, like sea salt. Too fine, and you’ll get sludge. Freshly ground beans always taste better. Aim to grind right before you brew.

Coffee-to-Water Ratio

This is where you make your concentrate. A good starting point is a 1:4 ratio (coffee to water). So, for example, 30 grams of coffee to 120 grams (or ml) of water. You can adjust this later.

Cleanliness/Descale Status

Give your AeroPress a quick rinse. If it’s been a while, a proper descaling is a good idea. Buildup can really impact the taste of your coffee, cold brew or hot.

Step-by-Step: How to Make Cold Brew Coffee with AeroPress

Here’s the rundown. We’re going to use the inverted method. It’s a bit more involved, but it prevents leaks while steeping.

1. Get your AeroPress ready. Take the plunger and push it into the chamber, just a bit. Enough to create a seal.

• Good looks like: The plunger is partially inserted, creating a stable base.
• Common mistake: Pushing the plunger all the way in. This will make it hard to add coffee and water later. Just a little way down.

2. Flip it over. Carefully turn the AeroPress upside down so the plunger is on the bottom.

• Good looks like: A stable, upside-down AeroPress.
• Common mistake: Dropping it. Be gentle. Find a flat surface for this step.

3. Add your coffee. Measure out your coarsely ground coffee and put it into the open chamber. For a standard batch, try 30 grams (about 4-5 tablespoons).

• Good looks like: A bed of evenly distributed coffee grounds.
• Common mistake: Not measuring. Eyeballing it leads to inconsistent results. Use a scale if you can.

4. Add your water. Pour in your cold or room-temperature filtered water. Start with about 120 ml (roughly 4 oz). Wet all the grounds evenly.

• Good looks like: All the coffee grounds are saturated.
• Common mistake: Pouring too fast. This can create channels and uneven extraction. Pour slowly and steadily.

5. Stir gently. Give it a quick, gentle stir to ensure all the coffee grounds are wet.

• Good looks like: A consistent slurry of coffee and water.
• Common mistake: Over-stirring. You don’t need to go crazy. Just a few turns to mix.

6. Cap it off. Place the filter cap on top of the AeroPress chamber. If using a paper filter, wet it first to rinse out any papery taste.

• Good looks like: The cap is securely in place.
• Common mistake: Forgetting the filter cap. This will lead to a mess when you flip it back.

7. Let it steep. Leave the AeroPress on your counter for 12 to 24 hours. Longer steeping means a stronger concentrate.

• Good looks like: A patient wait.
• Common mistake: Impatience. This is the longest part, but it’s crucial for cold brew flavor.

8. Flip it back. Carefully place your mug on top of the filter cap. Then, slowly and steadily flip the entire AeroPress setup over onto the mug.

• Good looks like: A smooth transition with no spills.
• Common mistake: Flipping too quickly or at an angle. This can cause coffee to spurt out. Take your time.

9. Press slowly. Gently and steadily press the plunger down. It should take about 20-30 seconds.

• Good looks like: A smooth, consistent press.
• Common mistake: Pressing too hard or too fast. This can force fine particles through the filter.

10. Dilute and enjoy. You’ve brewed a concentrate. Dilute it with cold water or milk to your preferred strength. A 1:1 or 1:2 ratio of concentrate to liquid is a good starting point.

• Good looks like: A perfectly balanced, refreshing drink.
• Common mistake: Drinking the concentrate straight. It’s usually too strong! Always dilute.

Common Mistakes (and What Happens If You Ignore Them)

Mistake	What it Causes	Fix
Using a fine grind	Muddy, bitter coffee; clogged filter	Use a coarse grind, like sea salt.
Not steeping long enough	Weak, watery flavor; not true cold brew	Steep for at least 12 hours, up to 24.
Using tap water	Off-flavors; chemical notes	Use filtered or bottled water.
Pressing too hard/fast	Bitter taste; sediment in the cup	Press gently and steadily for 20-30 seconds.
Not diluting the concentrate	Overwhelmingly strong, bitter flavor	Dilute with water or milk to taste.
Using stale coffee beans	Flat, dull flavor; lacks aroma	Use freshly roasted, whole beans and grind them just before brewing.
Not cleaning the AeroPress	Bitter, stale coffee residue impacting taste	Rinse and clean thoroughly after each use.
Inconsistent coffee-to-water ratio	Unpredictable strength and flavor	Measure your coffee and water using a scale for consistency.
Forgetting the filter cap	Messy spill during the flip	Always secure the filter cap before inverting.

Decision Rules

• If your cold brew tastes bitter, then you likely used too fine a grind or steeped for too long. Try a coarser grind or reduce steeping time.
• If your cold brew tastes weak, then you might need to increase your coffee-to-water ratio or steep for longer.
• If you see a lot of sediment in your cup, then your grind is too fine, or you pressed too hard.
• If your coffee has a chemical taste, then your water quality is likely the issue. Switch to filtered water.
• If you want a stronger flavor, then steep for 20-24 hours instead of 12.
• If you want a less intense flavor, then dilute your concentrate more with water or milk.
• If your AeroPress feels sticky or hard to press, then it’s time to clean and descale it.
• If you’re in a hurry, then hot AeroPress is faster, but this guide is specifically for cold brew.

FAQ

Can I use any AeroPress?

Yep, any AeroPress model will work for this. The method is the same.

How long can I store cold brew concentrate?

Stored in an airtight container in the fridge, it should be good for about a week.

Does the type of coffee bean matter?

It sure does. Medium to dark roasts generally work well for cold brew, bringing out chocolatey or nutty notes. Lighter roasts can sometimes be a bit too bright for cold brew.

What if I don’t have a scale?

You can use volume measurements (tablespoons/cups), but a scale offers much better consistency. For cold brew, a 1:4 ratio by weight is a good starting point.

Can I use hot water to start the steep?

No, that defeats the purpose of cold brew. You want to use cold or room-temperature water for the entire steeping process.

Is it okay to leave coffee grounds in the concentrate?

No, you want to press all the liquid through the filter to separate it from the grounds. Leaving grounds in will lead to over-extraction and bitterness.

What This Page Does NOT Cover (And Where to Go Next)

• Advanced AeroPress techniques for hot coffee.
• Detailed comparisons of different AeroPress accessories.
• Specific coffee bean recommendations for cold brew.
• Troubleshooting common AeroPress brewing issues beyond cold brew.