Can Cold Brew Coffee Be Heated? Should Iced Drip Cold Brew Be Made with Cold or Hot Water? What's the Difference Between Cold Brew and Regular Coffee?

An Introduction to Cold Brew Coffee

Cold brew coffee has become a daily companion for many coffee lovers thanks to its effortless preparation, rich flavor, and silky texture. In summer especially, the cold brew served at FrontStreet Coffee is always in high demand.

But as the weather turns colder, the audience for chilled coffee shrinks dramatically, and our cold brew stopped selling. So this morning, while staring at the bottles of cold brew sitting in the refrigerator, we found ourselves revisiting a question we'd seen a while back: can cold brew coffee actually be heated?

Can Cold Brew Coffee Be Heated?

Although we at FrontStreet Coffee have reheated all kinds of coffee before—pour-over, lattes, you name it—we realized we had never actually tried heating cold brew. So today, let's find out what warmed-up cold brew tastes like. (Admittedly, the topic sounds a little abstract... because it is.) But first, let's establish whether heating cold brew is even possible.

Because cold brew is normally served chilled, many people probably reacted the way we did: with a string of question marks. Strictly speaking, though, heating cold brew is not impossible at all. Why? Because "cold brew coffee" primarily refers to the extraction method—coffee brewed at low temperatures. Both drip-style ice drip coffee and immersion-style cold brew fall into this category, since both use cold water rather than hot water for extraction. In other words, any coffee extracted with cold water can be called cold brew coffee.

Cold water extracts inefficiently, which is why low-temperature brewing takes so long. But that same inefficiency is a feature: bitter compounds don't dissolve to excess, so over-extraction is rarely a worry. With proper parameters, the finished coffee shows clear flavors, a soft and smooth texture, and remarkably high sweetness. The low serving temperature further suppresses our perception of bitterness and acidity—which is exactly why cold brew is always enjoyed over ice, and why nobody bothers to heat it.

So the answer is yes: cold brew coffee can be heated. Which means today we get to find out what it actually tastes like!

How to Heat Cold Brew Coffee

There are plenty of ways to warm coffee, but not all of them are suitable. Take a machine's steam wand: it heats coffee fastest, but the injected steam dilutes the brew and carries residual milk flavors into the cup. We also advise against microwaves—for the same reason uncovered food picks up refrigerator odors, coffee in a microwave easily absorbs foreign smells. To keep the coffee undiluted and untainted, FrontStreet Coffee used the most straightforward method possible: direct heating. The steps are simple—take the cold brew out of the refrigerator and pour it into a heat-resistant container.

Turn on the induction cooktop and heat until the coffee reaches about 75°C, then remove it from the heat.

Pour it into a cup and start tasting.

Tasting Results and Analysis

The cold brew we used was made with Honduras Sherry beans. Before heating, it offered rich whiskey aromatics, cream, vanilla, and chocolate, with a touch of acidity and high sweetness, and a smooth, gentle texture. After heating, the whiskey note was noticeably weaker, chocolate bitterness came forward, and some berry acidity was amplified. The warmed flavor profile read: chocolate, berries, nuts, and whiskey, with more acidity, a touch of bitterness, lower sweetness, and a texture that was still smooth but no longer as gentle.

Honestly, it wasn't bad—nothing like as strange as we imagined. In fact, we half expected this outcome, because our earlier heating experiments with lattes and pour-over had shown the same pattern: heating changes a coffee's flavor and texture. There are two reasons. First, coffee's flavors come largely from aromatic compounds, most of which are volatile. Heating accelerates their evaporation, so after warming, many flavors are no longer as pronounced as before.

Second, temperature changes how our taste buds perceive taste. One reason cold brew doesn't taste particularly sour or bitter is that low temperature mutes both. As the coffee warms up, our perception of acidity and bitterness sharpens, so both become more prominent and less gentle. That, in a nutshell, is why nobody heats cold brew after brewing it—warm, it simply doesn't perform as well as it does cold. So while it's possible, we don't really recommend trying it.

FrontStreet Coffee Recommendation

Cold brew magnifies floral and fruity notes while muting woody, roast-y tones, so light-to-medium roast beans work best. If you love floral iced coffee, FrontStreet Coffee's Natural Huakui from Ethiopia is a superb choice: sun-dried to absorb abundant sweet compounds, it brews into a cold brew full of magnolia, creamy strawberry, dried mango, guava, and black tea notes.

For a cold brew with full-bodied juice-like character, pick FrontStreet Coffee's Kenya Cherry Tomato from the Thika region. Its cherry tomato, snow pear, black plum, and dark plum tones shine under cold extraction—low bitterness, plump acidity, and wonderfully refreshing over ice. Or try the FrontStreet Strawberry Candy Geisha blend, which combines Panama Geisha florals with Costa Rica honey-processing sweetness; when fermented and settled briefly, it takes on an almost fruit-wine character.