What is the difference between light roast and dark roast?

Roasting is the transformative process that turns raw, green coffee seeds into the aromatic beans we use for brewing. The roast level is essentially a choice about how much of the bean's original character you want to preserve versus how much you want to develop through heat. A light roast is designed to highlight the 'terroir'—the unique characteristics imparted by the soil, altitude, and variety of the coffee plant.

In a light roast, the beans are heated until they reach the 'first crack,' a point where the internal pressure causes the beans to pop. At this stage, the coffee retains much of its natural acidity and complex, delicate flavor notes, such as floral, fruity, or herbal qualities. Because the beans haven't been exposed to high heat for long, they remain dense and retain more of their original chemical structure.

Dark roasts, on the other hand, are pushed well past the first crack, often approaching or entering the 'second crack.' During this extended roasting time, the sugars in the bean caramelize and eventually carbonize, creating deep, rich flavors like chocolate, molasses, and smoke. The natural acidity of the bean is largely muted, replaced by a heavier body and a more pronounced bitterness. This is why dark roasts are often described as 'bold' or 'intense.'

It is a common myth that dark roasts have more caffeine. In reality, the caffeine content is relatively stable throughout the roasting process. However, because dark-roasted beans are less dense and have more volume, you might get more caffeine if you measure by volume (like a scoop) rather than by weight. If you measure your coffee by weight—which we always recommend—the caffeine difference between roast levels is negligible.

In practice, choosing between light and dark roast is a matter of personal preference. If you enjoy the subtle, complex flavors of a specific origin, a light roast is usually the best choice. If you prefer a rich, full-bodied cup with a classic, roasty finish, a dark roast will likely be more to your liking. Don't be afraid to experiment with different roasts from the same origin to see how the flavor profile changes.