What is the difference between light, medium, and dark roast?

Roasting is the transformative process that turns dense, green coffee seeds into the aromatic beans we brew. The roast level is determined by how long the beans are exposed to heat and the final internal temperature they reach. This process fundamentally alters the chemical composition of the bean, breaking down organic acids and developing sugars through the Maillard reaction and caramelization.

Light roasts are typically dropped shortly after the first crack, reaching internal temperatures between 355°F and 405°F. Because they spend less time in the roaster, they retain the most distinct characteristics of their origin, such as floral, fruity, or tea-like notes. They are often perceived as having higher acidity and a lighter body, making them a favorite for those who enjoy nuance and clarity in their cup.

Medium roasts occupy the middle ground, usually extending from the end of the first crack to just before the second crack. This stage balances the bean's inherent acidity with the sweetness developed during the roasting process. The result is a more rounded, approachable cup with a fuller body, often described as the classic "house blend" profile that works well across various brewing methods.

Dark roasts are pushed into or beyond the second crack, with internal temperatures exceeding 425°F. At this stage, the bean's cellular structure breaks down further, and oils migrate to the surface, giving the beans a shiny appearance. The original flavors of the origin are largely replaced by the flavors of the roast itself—typically deep, smoky, bittersweet, or dark chocolate notes. While some believe dark roasts are "stronger," this is a misconception; they are simply more developed, often resulting in lower acidity and a heavier mouthfeel.

In practice, choosing a roast level is a matter of personal preference and intended brewing method. If you want to taste the specific terroir of a region, start with a light roast. If you prefer a comforting, balanced cup, a medium roast is an excellent choice. If you enjoy bold, intense flavors or are brewing a traditional espresso, a dark roast may be your best companion.