You’ve found your coffee. The one your customers keep coming back for. A specific lot from a specific farm — same producer, same region, same name on the bag. You reorder it the following season and something’s shifted. Not dramatically, but enough. The brightness feels a little more subdued. The sweetness has moved. It’s still good, but it’s different. 

This is one of the most common conversations we have with roasters. And it’s worth talking about honestly, because the answer isn’t a quality control failure. It’s just coffee. 

Coffee is an agricultural product. It behaves like one. 

This sounds obvious, but it’s easy to forget when you’re dialling in a roast profile and building consistency around a particular cup. Coffee is grown in the ground, affected by weather, harvested by hand, and dried in the open air. Every single one of those variables shifts from year to year — sometimes slightly, sometimes significantly. 

The wine industry has normalised this concept through the idea of vintages. A 2019 Burgundy is not the same as a 2021 Burgundy, and no one expects it to be. Coffee hasn’t quite landed on the same language yet, but the underlying reality is identical. Harvest variation is real, it’s normal, and understanding it will make you a better buyer. 

Credit: Brazil Carmo Coffees. 

So what actually changes? 

A few things, and they’re all connected. 

• Rainfall. Too much rain during flowering and the cherry set is affected. Too little during the growing period and the beans develop unevenly. Water stress on the plant at the wrong moment can concentrate sugars in ways that sound appealing but often result in flat or hollow cups once roasted. Rainfall patterns are shifting across most of the major producing regions, and that’s not a short-term trend. 

• Temperature. Coffee develops its best complexity when it ripens slowly at high altitude under cooler temperatures. When temperatures spike during the growing season — which is increasingly common in Brazil, Ethiopia, and across Central America — the cherry can ripen too quickly. That accelerated development often strips nuance from the cup. What should be a layered, complex washed Ethiopian can instead land closer to a straightforward, one-dimensional profile. 

• The crop cycle itself. Arabica trees are biennial producers, meaning they tend to alternate between heavy and lighter crop years. After a high-yield season, the tree is under significant stress and the following harvest is often smaller and — in some cases — lower in quality. It’s not that the farmer has changed anything. The tree is just recovering. 

• Drying conditions. Post-harvest, the way coffee is dried plays a huge role in how it tastes. A season with unexpected rain during drying can force producers to rush the process or move coffee inside earlier than ideal. Uneven drying affects water activity, water activity affects shelf stability, and shelf stability affects what the coffee tastes like by the time it reaches your roaster. We’ve written more about water activity and why it matters here. 

Credit: Brazil Beneficio Pedra Branca. 

Does this mean the producer has done something wrong? 

Almost never. And this is the part that’s important to sit with. 

The producers we work with are skilled, meticulous, and deeply invested in quality. But they’re farming. They cannot control the weather. They cannot manufacture rainfall or lower the ambient temperature of a La Niña season. What they can do — and what the best producers do — is adapt. Adjusting fermentation times to compensate for temperature changes. Modifying drying protocols to account for humidity. Making real-time decisions with years of experience behind them. 

Variation is not a failure of process. It’s a feature of the product. 
 

What does this mean to you as a roaster? 

A few practical things. 

• Cup pre-shipment samples every time. Even if you’ve bought the same lot for three years running. The name on the bag is consistent. The coffee inside is a new crop. Pre-shipment samples exist precisely for this reason, and any importer worth working with will make them available. 

• Adjust your roast profile seasonally. A coffee that needed a longer development time last year might open up faster this year due to higher moisture uptake during a wetter growing season. Treat each new crop as a new profile conversation rather than assuming the same settings will apply. 

• Be honest with your customers. If you’re serving a single origin that people know and love, and the new harvest has a noticeably different profile, say so. Frame it as a seasonal update rather than an inconsistency. Most coffee drinkers — especially those buying specialty — will find that interesting rather than disappointing. It’s also just true. 

• Talk to your importer. If you’re noticing something off in a new arrival, that conversation is always worth having. It’s not a complaint — it’s useful information for both of us. 

The bigger picture 

Climate change is making harvest variation more pronounced, not less. The extreme weather events affecting Brazil’s Arabica output, the drought conditions across parts of East Africa, the temperature volatility at altitude — these aren’t isolated incidents. They’re patterns that are reshaping what’s available, when it’s available, and how it performs in the cup. 

The roasters who navigate this well are the ones who stay curious and stay connected. They understand that the coffee they’re buying has had a year — and some years are harder than others. 

That context doesn’t make the job easier. But it does make it more interesting. 

If you want to talk through a specific origin or get across what’s coming in the next harvest cycle, reach out to the team: 

USA: trade@opalcoffee.us  
NZ: trade@opalcoffee.nz 
AU: trade@opalcoffee.com.au