Coffee roasting transforms green beans into brown, aromatic ones over about 10–15 minutes: the roaster removes moisture, triggers the Maillard reaction and caramelization, hits “first crack,” then develops the roast to the target level. How long the roaster goes past first crack is what makes a coffee light, medium, or dark. Here’s the process, step by step.
Roasting Is a Lot Like Baking
Roasting coffee shares a lot with cooking: the quality of your ingredients, your tools, your skill, and your method all matter. Roasters take unroasted green coffee beans — the dried, hulled seeds of the coffee cherry — and roast them over roughly 10–15 minutes. Think of a coffee roaster as a specialized oven: it’s heated to around 400°F before the green beans go in.
The Roast Timeline
During the first ~7 minutes, the goal is to drive off the beans’ remaining moisture — essential, because the caramelization and flavor-building of the Maillard reaction can’t happen while the beans still hold water. Around the 9–10 minute mark, the beans reach “first crack,” an audible pop as they release stored energy. Everything after first crack is called “development,” and it’s where the roaster shapes the flavor: acidity and fruity notes fade while sweeter caramel and chocolate notes come forward. How far the roast goes from here decides the roast level.
Light, Medium, and Dark Roasts
Light roasts are pulled a short time after first crack. They keep higher acidity, fruity flavors, and a lighter body — ideal for exploring complex, distinctive profiles. Most of our single-origin coffees fall here, so their origin character stays front and center.
Medium roasts go a little longer, keeping some fruit and acidity while developing more sweetness — a chocolatey cup with enough brightness to stay lively. Many of our blends, like Founder’s Blend, land here and make excellent daily drinkers.
Dark roasts are roasted longest — around 15–16 minutes — with lower acidity and dominant caramel and dark-chocolate notes. They’re bold, stand up well to milk, and include roasts like our French Roast. For a deeper breakdown of each level, see our roast levels guide.
Ultimately there are no rigid lines between light, medium, and dark — some coffees blur the categories to reach a balanced, sweet cup. That harmony is always the goal. You can explore the results across our single origins, blends, and dark roasts.
Curious About the Details?
Ever wondered why some dark-roasted beans look oily? That comes down to how far the roast goes — we cover it in why coffee beans become oily. Want to try it yourself? See how to roast coffee beans at home. Either way, explore our roasts — roasted to order in Concord, CA.
