How Coffee Beans Are Processed: From Harvest to Drying

Ever wondered why your cup of coffee tastes fruity, nutty, or chocolatey? Much of that flavor starts long before roasting—in how the coffee bean is processed after harvest. Every coffee cherry picked goes through a series of steps that determine the final cup profile. Understanding this process helps you appreciate why origin, method, and care matter so much.

Coffee beans are the seeds of a fruit called the coffee cherry. They’re harvested once a year, usually when the bright red cherries are fully ripe. After picking, the cherries are processed—either dried in the sun or pulped and fermented—to remove the outer layers and dry the green bean inside. This processing shapes the coffee’s body, acidity, and aroma.

What Is a Coffee Bean, Really?

The coffee bean isn’t a bean at all—it’s the seed of a fruit resembling a cherry, commonly called a coffee cherry. These cherries grow in clusters on coffee tree branches. Each cherry has an outer skin (exocarp) that’s thick and bitter, a sweet, grape-like pulp (mesocarp), a sticky layer called mucilage (like honey), and an inner parchment skin (endocarp) protecting two green coffee beans. Each bean is also coated with a thin silvery film called the silverskin or seed coat.

When and How Are Coffee Cherries Picked?

Coffee is generally harvested once a year, with timing based on location. In the Northern Hemisphere, picking usually happens between September and March, while the Southern Hemisphere sees harvests from April to May. Most coffee is hand-picked—either strip-picked (all cherries at once) or selectively picked (only ripe ones), with the latter more costly and used mainly for high-quality Arabica.

Two Main Coffee Processing Methods

Once picked, coffee cherries must be processed to extract and dry the beans. There are two main methods: natural (dry) and washed (wet).

Natural (Dry) Process

The simplest and most economical method: freshly picked coffee cherries are spread out in the sun to dry, typically for 7 to 10 days. Workers regularly rake and turn the cherries to ensure even drying. The goal is to reduce moisture content to around 11%. As they dry, the outer skin turns yellow, and the beans inside begin to rattle.

Washed (Wet) Process

In contrast, the washed method removes the coffee cherry’s pulp within 24 hours of harvesting. A depulper strips off the skin and fruit, then the beans are placed in fermentation tanks for 12 to 48 hours. Natural enzymes break down the sticky mucilage. After fermentation, the beans are either sun-dried or machine-dried. This method tends to produce cleaner, brighter flavors.

Drying, Milling, and Exporting Green Coffee

After drying, all remaining layers—the husk, mucilage, parchment, and sometimes the silverskin—are removed in a step called hulling. Lighter or defective beans are often sorted out using vibrating tables or air blowers. The final product is green coffee: unroasted beans ready for export. These are typically packed in jute or hessian sacks, or large plastic containers, with global shipments totaling around 7 million tons annually.

Frequently Asked Questions

What is the coffee cherry?

The coffee cherry is the fruit of the coffee tree. Inside its skin and pulp are two green coffee beans surrounded by protective layers including mucilage, parchment, and silverskin. The cherry must be processed to extract these beans.

How are coffee cherries harvested?

Coffee cherries are usually harvested once a year, depending on the region—typically September to March in the Northern Hemisphere and April to May in the Southern Hemisphere. Most are picked by hand, either strip-picked (all at once) or selectively (ripe only), with selective picking reserved for higher-quality Arabica.

What is the difference between natural and washed coffee processing?

Natural processing dries the whole coffee cherry in the sun, taking 7–10 days to reach 11% moisture. Washed processing removes the cherry’s pulp within 24 hours, then ferments the beans before drying, often producing cleaner and brighter flavors compared to the fruitier profile of natural process.

How long does coffee drying take?

Drying time depends on the method. Natural (sun) drying usually takes 7 to 10 days, while washed coffee may take additional time depending on fermentation and drying method—sun or machine. Some natural processes, like those used for Ethiopia’s Yirgacheffe, can take up to 27–30 days.

What is green coffee?

Green coffee refers to unroasted coffee beans that have been processed, dried, and hulled. These beans are shipped worldwide in jute or plastic sacks and are ready for roasting before brewing.

Recommended FrontStreet Beans for Natural Process Fans

FrontStreet Coffee offers several single-origin naturals that showcase the impact of sun-drying. Their Ethiopia Yirgacheffe Red Cherry is a classic natural processed lot, offering tropical fruit, floral notes, and a rich sweetness after medium roast. The Ethiopia Humbera (often called '') highlights jasmine and citrus with a juicy body thanks to its high-altitude natural processing. For something earthier and more rustic, try the 2013 Yunnan Arabica, sun-dried in China’s dry season for a nutty, berry-forward cup with hints of dried plum and light tea-like finish. All are excellent examples of how natural 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.