Walk into a good café and you'll find a roast date printed on the bag, sometimes down to the hour. Ask when the coffee was harvested and you'll often get a shrug. That gap matters. The roast date tells you how many days the coffee has been off the drum; the harvest date tells you how many months it has been off the tree. Both shape what ends up in your cup.
Coffee is a fruit, picked in a window that shifts from country to country and sometimes from one valley to the next. Learning those windows is the simplest way to buy better single-origin beans without spending a cent more. Here's how the calendar works, and how to use it.
Roast date gets all the attention because it's easy to print and easy to check. It's also the shorter of the two timelines. Roasted coffee is generally at its best somewhere between a few days and a few weeks off the roast, depending on the bean, the process and how you brew it. Green coffee, by contrast, spends months in a warehouse before it ever meets heat — and it doesn't sit still while it waits.
A green coffee that lands in Europe in June from a harvest that finished the previous September can be perfectly sound. But it will taste different from the same lot shipped and roasted within a few months of picking. Flavours flatten, acidity softens, and the bright fruity top notes that make a natural Ethiopian so distinctive tend to fade first. Older green often reads as slightly generic in the cup: sweet, pleasant, a little vague about where it came from.
None of this means you should only drink coffee picked last month. It means you should know what you're buying. A six-month-old washed Colombian and a two-month-old one can both be excellent — but they are different coffees, and the roaster's tasting notes were almost certainly written on the fresher one.
Harvests in the northern and southern tropical belts fall at different times, and the biggest exporters each run their own rhythm. Keep in mind that altitude, variety and weather can move dates by several weeks.
If you want Kenyan coffee close to its peak, buy in late spring and early summer. For Ethiopian naturals at their most vivid, look in spring. Brazil is at its best from autumn into winter, and Colombia is the dependable one — which is part of why so many espresso blends lean on it all year round. A roaster with a real single-origin programme rotates the menu for exactly this reason: not to chase novelty, but because that's when each origin is actually worth buying.
Labels are inconsistent, so know what to look for and what to ask. If the bag carries a harvest date or a crop year — "Harvest 2024", "crop 24/25" — treat it as a good sign. The crop year normally refers to the harvest that began in that calendar year. Coffee more than a year off harvest is worth questioning, and if you can't work out when it was picked, that's a conversation rather than a gamble.
Ask three things: when was it harvested, how has it been stored, and when did you roast it. Most small roasters answer happily. If they can't, the information probably doesn't exist.
Process matters too. Washed coffees tend to hold their structure for longer, while natural and experimental lots can be spectacular early and lose their edge faster. If you're buying a large bag of a bold natural, buy it near the harvest and consider splitting it with a friend.
Two coffees can be equally fresh by the calendar and taste entirely different because of how they were kept. Green coffee wants stable, moderate conditions. It tolerates time reasonably well and tolerates damp, heat and sharp swings badly; stored poorly, it develops a flat, musty character no roast profile can rescue.
Roasted coffee is the opposite: it wants protection from oxygen, light and heat, and it wants to be drunk. A one-way valve helps, a sealed tin helps, and grinding just before brewing helps more than most equipment upgrades. Buy bags you'll finish in two to four weeks.
Freezing works if you do it properly. Put the whole bag in the freezer before you open it, keep it sealed, and take it out only to grind — grinding beans straight from the freezer is fine and keeps them cold. What you want to avoid is a bag going in and out of the freezer every morning, thawing and picking up moisture each time.
Before you commit, ask whether the coffee comes from the current crop, whether the roaster can tell you roughly when it was picked, and whether the bag size suits how fast you drink. If the answer to the first two is vague, choose something else — there is always another lot, and the calendar will bring you a fresher one within a few months. Buy the newest crop you can find, store it well, drink it while it's still telling you where it came from.
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