What does the roast date on coffee mean?

The roast date is the day green coffee was roasted. Everything about a coffee’s freshness is measured from that point.

Why it matters more than a best-before date

A best-before date is a food safety formality. Roasted coffee is dry and stable, so it is safe for a very long time — which is why those dates often sit twelve or twenty-four months out. That number tells you nothing about quality.

A roast date tells you where in the useful window the coffee sits. Around five days to five weeks is where it is at its best; beyond about six weeks the aromatics that distinguish one origin from another are fading.

What its absence tells you

If a bag carries only a best-before date, the coffee was probably roasted a long time ago and the roaster would rather you did not know. Supermarket coffee is frequently months old by the time it reaches a shelf.

Roasters proud of their freshness print the roast date prominently, sometimes stamped by hand. It is one of the fastest ways to judge a bag before opening it.

What to do with the number

Under 5 days — let it rest. Very fresh coffee is still degassing, which makes espresso gush and filter brews foam aggressively.

5 to 35 days — brew it. Espresso often peaks slightly later than filter, around 10 to 21 days.

Over 6 weeks — usable, and expect generic rather than distinctive.

Where “best before” still helps

For decaf and for very dark roasts, the window is a little more forgiving — decaffeination alters the bean structure and dark roasts had less delicate aromatic character to lose.