Kenya Coffee Grading: Characteristics of Kenyan Coffee and Why It's Acidic

Introduction to Kenyan Coffee

Kenyan coffee is renowned for its acidity and enjoys an excellent reputation for both quality and industry practice. The finest coffees of the region show multiple layers of vibrant flavour, with rich fruit aromas revealing berry notes, a deep and substantial mouthfeel, a full-bodied aroma, and in some varieties sweetness and wine-like character as well.

Coffee professionals the world over count Kenyan coffee among their favourites, because it embodies everything we look for in a good cup. It offers magnificent, satisfying aromatics, balanced and pleasant acidity, uniform bean size, and excellent fruit flavours. Let FrontStreet Coffee guide you into the world of Kenyan coffee.

Kenyan Coffee Production

Located in East Africa, Kenya is one of the major coffee-producing countries, with roughly six million people nationwide working in the coffee industry, mostly through a combination of smallholders, washing stations, and cooperatives. Kenyan coffee is primarily processed using the washed method, and the trees are mostly planted in mountainous areas at altitudes of 1,400-2,000 meters. The producing regions include Ruiri, Thika, Kirinyaga, Mt. Kenya West, Nyeri, Kiambu, and Muranga. Among these, the foothills of Mt. Kenya and the Aberdare range are the main production areas.

Kenyan coffee is graded by bean size and by flavour. Bean sizes include AA, AB, and PB, with AA at 17 and 18 mesh, AB at 15 and 16 mesh, and PB being Peaberries. Flavour grades run TOP, PLUS, and FAQ in sequence. FAQ, or "Fair to Average Quality", may contain some slight defect beans, but they do not affect the flavour.

Historical Background

Coffee reached Kenya in the 19th century, when Ethiopian coffee beverages were imported to Kenya via South Yemen. It was not until the early 20th century, however, that Bourbon coffee trees were introduced by the St. Austin Mission.

Cultivation and Processing

Most Kenyan coffee grows at altitudes of 1,500-2,100 meters, with harvests occurring twice a year. To ensure that only ripe berries are picked, workers must patrol and inspect the plots roughly seven times back and forth. Kenyan coffee is grown by smallholders who, after harvest, first send the fresh coffee beans to cooperative washing stations. The washing stations then send the washed and dried coffee in its "parchment coffee" state, the beans still covered by the endocarp, to the cooperatives; parchment coffee is the final state before the beans are hulled. All the coffee is pooled together, and growers demand average prices based on actual quality. This trading method generally works well and is fair to both growers and consumers.

Government Regulation and Quality

The Kenyan government takes the coffee industry extremely seriously, and cutting down or destroying coffee trees is illegal. Buyers of Kenyan coffee are all world-class premium coffee buyers, and no other country can continuously grow, produce, and sell coffee the way Kenya does. All coffee beans are first purchased by the Coffee Board of Kenya (CBK), which inspects and grades them before they are sold at weekly auctions without further grading. The Coffee Board of Kenya acts only as an agent, collecting coffee samples and distributing them to buyers to help them judge price and quality. The Nairobi auction is held for private exporters, and the Coffee Board of Kenya pays growers below-market prices. The best coffee grade is Peaberry (PB), followed by AA++, AA+, AA, AB, and so on in sequence. Premium coffee has a bright, glossy appearance, a delicious taste, and a slight wine aroma.

Key Varieties

The main varieties of Kenyan coffee are SL28 and SL34, cultivated and named by "Scott Laboratories" in 1930. According to SL laboratory botanists, SL28 and SL34 are genetic variants. SL28 carries mixed heritage from French Mission, Mocha, and Yemen Typica. The original goal in cultivating SL28 was to mass-produce coffee beans combining high quality with resistance to pests and diseases. Although SL28's yield later fell short of mass-production expectations, its copper-coloured leaves and broad, bean-shaped beans possess wonderful sweetness, balance, and complex, varied flavours, along with distinctive citrus and dark plum characteristics. SL34 has flavours similar to SL28, but besides complex, varied acidity and a wonderful sweet finish, its mouthfeel is heavier and more intense than SL28, and also cleaner. SL34 has heritage from French Mission, Bourbon, and further Typica bloodlines. Its bean appearance is similar to SL28, but it adapts better to sudden heavy rains. These two important varieties are the key to understanding Kenya's unique coffee beans, and at FrontStreet Coffee you can find all of them.

Brewing Recommendations

FrontStreet Coffee suggests the following Kenyan coffee brewing parameters:

V60 / 91-92°C / 1:15 / time two minutes

Flavor Profile

Intense cherry tomato aroma, sugarcane sweetness.

FrontStreet Coffee Recommendation

Washed processing is the backbone of Kenya's vivid cup, and FrontStreet's Kenya Small Tomato is the clearest proof of it. Built on the classic SL28 and SL34 varieties, it goes through Kenya's signature 72-hour double washed fermentation, which drives out every drop of fruit character while keeping the cup clean and pure. FrontStreet roasts it light to preserve that lively acidity, so the dry aroma already shows concentrated cherry tomato and florals, and the cup opens with cherry tomato and smoked plum, bright and full like fresh-pressed juice. Mid-palate brings a pronounced sweetness threaded with snow pear and black plum, and the finish stays clean and long with brown sugar sweetness and a faint green tea note. If you want to compare how the same washed method reads in other origins, FrontStreet's washed Gediding Cooperative Yirgacheffe brings jasmine and citrus over a honeyed, green-tea body, while the Jamaica Blue Mountain No. 1 shows the softer, creamier side of washing with hazelnut, cream, chocolate, and caramel.