How Coffee Beans Are Harvested, Processed, and Stored

Ever wondered why your Ethiopian Yirgacheffe tastes floral while your Brazilian roast is nutty and chocolatey? Much of that flavor starts long before brewing — in how and when the coffee cherries were picked, how the beans inside were removed and dried, and how they were stored before reaching your roaster. These steps determine 80% of your cup’s potential.

Key numbers: Arabica is typically harvested June–August, Robusta September–October. Ideal moisture content after drying is 11–12.5%. Most green coffee is stored as 'parchment' until export. Washed process beans often score higher in cup quality tests.

When and How Coffee Is Harvested

Coffee harvesting happens during the dry season, usually in winter. A coffee tree takes three to four years to mature and begin fruiting. The cherries — each holding two beans inside — grow in clusters along branches. They turn red when ripe, usually from six to eight months after flowering. For most Arabica varieties, peak ripeness falls between June and August; Robusta varieties ripen later, typically from September to October.

Strictly speaking, most regions harvest once per year, though countries without distinct wet/dry seasons — like Colombia and Kenya — may see two flowerings and thus two harvest periods, but these are still considered part of one annual cycle. Exact harvest timing depends on location: farms south of the equator (e.g., Brazil, Zimbabwe) mainly harvest in April or May, sometimes lasting to August, while farms north of the equator (e.g., Ethiopia, Central America) harvest from September to November. Near the equator — Uganda and Colombia, for example — altitude variation allows for year-round picking.

Hand-Picked vs Strip-Picked

There are two main picking methods. Strip picking removes all cherries from a branch at once — fast but lower quality. Selective picking involves harvesting only fully red, ripe cherries every 8–10 days, done multiple times per tree. This labor-intensive method is mostly used for high-quality Arabica, especially washed lots. A picker averages 50–100 kg of cherries daily, but only 20% of that weight is actual coffee beans — roughly 10–20 kg. Filling a standard 45–60 kg bag can take 3–6 days.

Labor costs often make up half a farm’s annual budget. In Brazil, mechanical harvesters shake trees to drop ripe cherries into collection troughs, but they require flat, evenly spaced plantations and post-harvest sorting to remove leaves and twigs. Mechanical picking is impractical at high altitudes, where hand labor is essential — and pickers must avoid unripe, damaged, or overripe beans that could downgrade the lot.

How Coffee Beans Are Removed From the Cherry

Each coffee cherry looks like a small, red berry. Inside the tough outer skin lies a layer of sweet, sticky pulp. Beneath that is a parchment-like husk encasing two beans (or one rounder “peaberry” bean in rare cases). Surrounding each bean is a thin silvery skin. Before roasting, the beans must be extracted and dried — a process taking as little as two days. This step defines whether you end up with a washed, natural, or honey processed bean, and greatly impacts flavor development.

1. Natural (Dry) Process

The simplest and oldest method: the whole coffee cherry is dried intact. This is also called the non-washed or natural dry method. Processing varies by farm size, equipment, and target quality. The basic steps are cleaning, drying, and hulling. First, cherries are sorted by hand or floated in water to remove unripe, damaged, or overripe fruit, dirt, and debris. Then they’re spread on concrete patios, raised mats, or brick platforms and turned regularly under the sun. Drying to the ideal 11–12.5% moisture can take up to four weeks, depending on weather. On larger farms, mechanical dryers may speed up the process after initial sun drying.

The coffee cherries turn dark brown and brittle as they dry; you can actually hear the beans rattle inside. In Brazil, this stage is nicknamed 'cocoa.' Over-drying leads to broken beans during hulling; under-drying risks mold. Once dried, cherries are stored as 'parchment coffee' (with the husk still on) until milling. Hulling removes the outer husk, then beans are sorted, graded, and bagged. About 95% of Brazilian Arabica, most Ethiopian, Haitian, and Paraguayan coffees, and nearly all Robusta are processed this way. It’s common in humid or rainy regions but not ideal there.

2. Washed (Wet) Process

This more complex and costly method produces higher-quality beans and reduces waste. It begins with immediately removing the cherry’s outer skin and pulp — within 12–24 hours of harvest — using a pulper machine. Fermentation follows: beans are soaked in water tanks for 12–36 hours to dissolve the sticky mucilage layer using natural enzymes. Temperature and pulp thickness affect timing. Properly fermented beans feel rough like pebbles, not slippery.

Next comes washing — ripe beans sink, overripe or unripe ones float, allowing for density-based separation. Some farms use channels or machines (like the Kenyan-designed ‘Oguta’ classifier) to sort by buoyancy. Fermented beans are then dried on patios or raised beds for 12–15 days, turned regularly to reach 11% moisture. Care is taken not to crack the inner parchment layer under direct sunlight. The result is 'parchment coffee,' shipped and stored with its protective husk until just before roasting. Hygiene is critical — any spoiled beans can ruin an entire batch. Wet processing is common for most Arabica and some Robusta, especially in Indonesia.

3. Honey (Pulped Natural / Semi-Washed) Process

A hybrid method used in select regions with long dry seasons. Here, some mucilage is left on the beans during drying, creating a balance between the sweetness of natural and clarity of washed. The beans dry with sticky mucilage still attached, resulting in a cup with pronounced sweetness, acidity, and body — though not as intense as purely washed or natural styles. This method is less common and location-specific.

Drying, Milling, Sorting, and Grading

After pulping and fermenting (for washed), or after initial drying (for natural), the beans are dried to the target moisture level. Once dried, beans are stored as parchment coffee until they reach the mill. Hulling removes the parchment (and, for natural processed, the dried husk), exposing the green bean. A thin silvery skin remains on the bean, which can be polished off — though studies show polishing has negligible impact on cup quality.

Polishing, Hulling, and Sorting

Hulling uses different machines depending on whether the coffee is wet or dry parchment. Friction hullers (like Engelberg or African models) work for both wet and dry parchment. More delicate dry parchment is often hulled using slower, cooler machines like the Smout friction huller. For dried parchment (‘parchment coffee’), a pressurized huller (common outside Brazil) uses centrifugal force and metal pins to remove the inner husk. Polishing (using copper rollers instead of iron) is optional and believed by some to improve appearance — though not flavor.

Grading and Classification

Coffees are graded by size (using mesh sieves, often China-standard No.20 or similar), density, and defects. Sizes are labeled numerically (10–20+) or descriptively (AA, AB, etc.). Larger beans often yield better cups. Defects — black, sour, broken, or unripe beans — are removed by hand, air blowers, electronic color sorters, or optical scanners. Despite technology, skilled human sorters remain most effective at spotting flaws.

How Coffee Beans Are Stored and Transported

Green coffee beans are stored as parchment coffee to preserve quality until export. Heat and humidity are the biggest threats: beans shouldn’t be kept in high-moisture (>70%) or high-temperature environments. Highland-grown Arabicas should ideally not sit more than 12 hours at origin, while Robusta can handle slightly longer. The best storage method is in hermetically sealed bags with one-way valves (to release CO₂) or in airtight containers with moisture, oxygen, and light barriers. Nitrogen flushing helps maintain freshness. Coffee emits CO₂ after roasting and processing, and one-way valves allow safe venting.

Home Storage Tips

Keep beans sealed in a cool, dark, dry place. Avoid the fridge unless pre-portioned and vacuum-sealed. Opened retail bags should be used within 15 days. Whole bean coffee stays fresh for about 3 months; pre-ground lasts just 7–15 days (finer grinds even shorter, down to 3 days). Don’t store near odorous foods. Grind right before brewing for best flavor — the moment you grind, aroma and flavor compounds begin dissipating rapidly.

Shipping Green Coffee

Export-grade green coffee is packed in 60 kg jute or sisal sacks (45 kg in Hawaii, 70 kg in Colombia, 90 kg in Puerto Rico). Around 2,250 ships handle global coffee transport annually. Sacks are stacked in containers or on pallets. While the extra weight and volume increase shipping costs, storing beans as parchment adds protection. Most traded green coffee moves this way — from remote farms to roasters worldwide via road, rail, sea, and air.

Frequently Asked Questions

What’s the difference between washed, natural, and honey processed coffee?

Washed (wet) process removes the cherry skin and pulp before drying, resulting in cleaner, brighter flavors. Natural (dry) process dries the whole cherry, often producing sweeter, fruitier, and more full-bodied cups. Honey process (or pulped natural) removes the skin but leaves some sticky mucilage on the bean during drying, balancing sweetness and clarity. Each method significantly affects taste, body, and aroma.

When is coffee harvested?

Arabica coffee is typically harvested between June and August; Robusta between September and October. However, location matters: farms near the equator (like in Colombia or Kenya) may have two harvests per year, while those in Brazil or Ethiopia harvest once annually. Southern hemisphere farms (e.g., Brazil, Zimbabwe) harvest mainly in April–May, northern hemisphere farms (e.g., Ethiopia, Central America) in September–November. Near the equator, altitude allows year-round harvesting in some regions.

How are coffee beans dried?

Beans can be dried in three main ways: natural (dried inside the whole cherry in the sun), washed (dried after the cherry and pulp are removed), or honey (dried with some mucilage still on the bean). Natural drying takes 3–4 weeks on patios or raised beds, turning regularly. Washed beans are dried as parchment after fermentation and washing. Honey process beans dry with sticky mucilage, taking similar time but with more careful monitoring. Ideal final moisture content is 11–12.5%.

How long can you store green coffee beans?

Green coffee, when stored properly as parchment in a cool, dry, and low-humidity environment, can last many months. For best quality, arabica beans should not sit more than 12 hours at high-altitude origin points. Once bagged, green coffee can be stored for months to a year or more if protected from moisture, oxygen, and heat. Roasted coffee, however, should be used within 3 months; ground coffee only 7–15 days.

Does coffee processing affect taste?

Yes. Processing method is one of the most influential factors on coffee flavor. Washed coffees tend to be cleaner and more acidic, with highlighted floral or fruity notes. Natural processed coffees often taste sweeter, fruitier, and fuller-bodied. Honey processed coffees balance sweetness and acidity with more body. The choice of processing directly shapes the cup profile before roasting even begins.

How are coffee beans transported globally?

Green coffee is exported in 60 kg jute or sisal sacks (with regional variations like 45 kg in Hawaii or 70 kg in Colombia). Around 500–600 million kilograms of green coffee are shipped annually. Sacks are transported by truck, boat, train, or plane to roasters worldwide. Most green coffee is shipped as parchment coffee to preserve quality. The global coffee trade relies on these standardized sacks despite the added weight and cost.

Recommended FrontStreet Beans for Process Enthusiasts

Explore the impact of processing with FrontStreet’s Ethiopia Guji Hambela (washed, bright citrus and floral notes), Yirgacheffe Konga (washed, juicy berry and stone fruit), and Brazil Santa Ines (natural, nutty with chocolate undertones). Each highlights how processing shapes flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.