Indonesian Green Coffee: Regions, Processing, and Grading Standards

A practical reference for roasters and buyers on Indonesian raw coffee bean origins, processing methods, and the defect, moisture, and screen-size standards that shape sourcing decisions.

Indonesian coffee is grown across a wide range of altitudes, and elevation shapes both bean density and cup character. Higher-grown lots tend to develop denser beans with more pronounced acidity, while lower-altitude coffees are often softer and heavier in body. Buyers reviewing a lot should note the growing altitude alongside the variety, since the two together give a first indication of what to expect after roasting.

Processing is the other decisive factor. Wet-hulled processing, known locally as giling basah, is a signature method in Sumatra and produces the earthy, heavy-bodied profile the region is known for. Washed processing separates cherry from bean through fermentation and water, generally yielding cleaner, brighter coffees. Each method changes the moisture content and defect profile of the finished green bean, which is why sourcing teams check moisture and defect counts before committing to a lot.