What is the difference between cold brew and iced coffee?

The distinction between cold brew and iced coffee is not merely a matter of serving temperature, but a fundamental divergence in chemical extraction. Hot brewing—the standard for iced coffee—uses thermal energy to rapidly dissolve a wide spectrum of compounds, including volatile acids and oils that provide the brightness and complexity prized by producers. When this hot liquid is chilled, those characteristics remain, resulting in a beverage that mirrors the profile of a hot cup.

Cold brew, by contrast, relies on time rather than heat. By steeping grounds in cold or room-temperature water for 12 to 24 hours, the extraction process favors different solubility rates. Research supported by the Coffee Science Foundation confirms that cold-steeped coffee consistently yields a higher pH (lower acidity) and a distinct sensory profile often described as more floral and less bitter or 'rubbery' than its hot-brewed counterpart. A common misconception is that cold brew is inherently 'stronger' or more caffeinated; in reality, caffeine extraction plateaus after a few hours, and the perceived strength is usually a function of the concentrate-to-water ratio used by the producer.

For the farmer, this matters: cold brew’s mellow, sweet profile can mask the nuanced terroir of high-quality, high-altitude beans that would otherwise shine in a hot-brewed format. While cold brew offers a consistent, low-acid product that appeals to a broad market, it effectively flattens the vibrant, acidic characteristics that many specialty producers work to cultivate in their crops.