How long does coffee stay fresh after roasting?

The optimal tasting window of a specialty coffee sits between 7 and 45 days after roasting, peaking between 10 and 28 days depending on method and roast degree. Beyond 45-60 days the coffee is not unsafe, but it gradually loses aromatic brightness, body and sweetness. Different from the industrial best-before date (often 12-24 months), which is a safety guarantee, not a quality one.

A roasted coffee ages in three phases. Phase 1 (days 0-7): heavy degassing; the coffee tastes 'too wild', extraction is unbalanced, CO2 forms a barrier. Phase 2 (days 7-45): the sweet spot. Degassing has steadied, aromatics peak, extraction is consistent. Phase 3 (days 45+): progressive oxidation. Surface lipids start to go rancid, volatile aromas (floral, fruity) are the first to fade, often leaving only a baseline chocolate-hazelnut body with no nuance. Past 90 days, a bag opened regularly is usually flat and papery, even when not unsafe.

Three factors modulate this curve. First, roast degree: a light roast keeps better (less porous cell walls, fewer surface lipids, realistic window 10-45 d); a dark roast ages faster (surface oils go rancid, window 7-21 d). Second, format and storage: a 250 g valve bag reopened 15 times holds up better than a 1 kg bag opened daily. Third, form factor: whole-bean, 4-6 weeks; ground, 7-14 days maximum, often less if exposed — oxidation surface is multiplied by 1 000 at grinding.

The distinction between tasting window and best-before date is critical. Industrial best-before is 12 to 24 months after roasting: that is a safety guarantee (no pathogens, no food risk), not an aromatic one. An industrial coffee bearing an 18-month best-before, roasted 8 months ago, is already well past its flavour peak. Belgian specialty roasters (Brussels, Ghent, Antwerp, Liège) almost always print an explicit roast date — sometimes labelled 'roasted on' or 'Torr.' — instead of or alongside the best-before. In Walloon Brabant, the café-wine scene leans into that transparency: a coffee served at a bar such as 20hVin or La Cave du Lac is typically roasted 2-4 weeks earlier by a local roaster, something the menu sometimes states outright.

Post-roast freshness curve