Cold Brew Coffee

Not All Beans Cold-Brew Well: Here’s What to Look For

Updated July 2026 · 5 min read

Quick Answer

For a 1:16 ratio, I use 100g of medium to dark roast coffee beans with a coarse grind to make 1600g of cold brew coffee.

Understanding Cold Brew Coffee

Cold brew coffee is made by steeping coarse-ground coffee beans in water at a low temperature, typically between 4°C and 21°C (39°F and 70°F), for an extended period, usually 12-24 hours. I prefer a brew time of 18 hours for a balanced flavor.

In my experience, the key to a great cold brew is using the right ratio of coffee to water, which is usually around 1:16. This means for every 1 gram of coffee, you use 16 grams of water.

Factors to Consider When Choosing Coffee Beans

When selecting coffee beans for cold brew, consider the roast level, bean origin, and processing method. I find that medium to dark roast beans work best for cold brew, as they provide a richer flavor. Beans from regions like South America and Africa tend to have a brighter acidity, while those from Asia have a heavier body.

A good cold brew coffee maker, as discussed in The Best Cold Brew Coffee Makers for Home Use, can also make a significant difference in the brewing process.

My Personal Experience with Cold Brew

I remember the first time I made cold brew at home, I used a 1:12 ratio and steeped the beans for 12 hours. The result was a strong, but not very balanced, coffee. I then experimented with different ratios and brew times, eventually finding that a 1:16 ratio and 18-hour steep time produced the best flavor.

The smell of the coffee beans as I ground them was earthy and slightly sweet, and the sound of the grinder was a familiar and comforting noise. As I poured the cold brew into a glass filled with ice, I was struck by the rich, smooth texture and the flavors of chocolate and caramel.

Roast Level and Cold Brew

The roast level of the coffee beans can significantly impact the flavor of the cold brew. Lighter roasts tend to have a brighter acidity and more pronounced fruit notes, while darker roasts are richer and more full-bodied. I prefer to use a medium to dark roast, as it provides a balanced flavor with notes of nuts and chocolate.

A good resource for learning more about roast levels and their impact on cold brew flavor is Introduction to Cold Brew Coffee.

Bean Origin and Cold Brew

The origin of the coffee beans can also impact the flavor of the cold brew. Beans from different regions have distinct flavor profiles, and some work better for cold brew than others. For example, beans from Ethiopia tend to have a bright acidity and fruity notes, while those from Brazil have a heavier body and nuttier flavor.

I find that a blend of beans from different regions can create a more complex and interesting flavor profile.

Grind Size and Cold Brew

The grind size of the coffee beans is crucial for cold brew, as it affects the extraction of the coffee. A coarse grind is typically best, as it allows for the right amount of extraction without becoming too fine and bitter. I use a burr grinder to grind my beans, as it provides a consistent grind size and doesn’t generate heat, which can damage the beans.

A good grind size is around 1.5-2.5 mm, which is similar to kosher salt.

Steps to Make Cold Brew at Home

To make cold brew at home, follow these steps:

Measure out 100g of coffee beans and grind them to a coarse grind.
Place the ground coffee in a large glass or plastic container.
Add 1600g of water to the container and stir to combine.
Steep the mixture in the refrigerator for 18 hours.
Strain the coffee into a separate container and discard the grounds.

For more detailed instructions, check out A Step-by-Step Guide to Making Cold Brew at Home.

Conclusion and Next Steps

In conclusion, choosing the right coffee beans for cold brew is crucial for a great flavor. Consider the roast level, bean origin, and processing method, and experiment with different ratios and brew times to find your perfect cup. With the right equipment, such as a cold brew coffee maker, and a little practice, you can create a delicious cold brew at home.

For more information on cold brew coffee and how to make it at home, check out The Ultimate Cold Brew Coffee Recipe for Home Brewers and Best Cold Brew Coffee Makers for Home.

Frequently Asked Questions

What is the best roast level for cold brew?

Medium to dark roast is usually best for cold brew, as it provides a richer flavor.

How long should I steep my cold brew?

12-24 hours is typical, but I find that 18 hours provides the best balance of flavor.

What is the best grind size for cold brew?

A coarse grind, around 1.5-2.5 mm, is usually best for cold brew.