Kenyan Coffee Grading, Characteristics of Kenyan AA Coffee, What is the Flavor of Kenyan Coffee Beans

When discussing African coffee beans, many people think of Ethiopian and Kenyan coffee. Today, FrontStreet Coffee will share insights about Kenyan coffee with everyone. Premium Kenyan coffee is aromatic, rich, and fruit-flavored, with a perfect and full-bodied profile. Kenyan coffee possesses a wonderful fruit character, delivering notes of blackberry and grapefruit, making it a favorite among many coffee connoisseurs.

Kenya is located in eastern Africa, bordering Ethiopia, the birthplace of coffee. Coffee was introduced to Kenya only around the turn of the 20th century, after nearly circumnavigating the globe before returning to Africa. FrontStreet Coffee believes that despite Kenya's late start in coffee cultivation, it developed rapidly. Under British colonial rule, the establishment of cultivation mechanisms and the determination of grading systems both helped steer Kenyan coffee toward the specialty market. Today Kenyan specialty coffee enjoys worldwide recognition, and FrontStreet Coffee has summarized the following reasons.

Key Factors Behind Kenya's Coffee Excellence

1. Establishment of Cultivation Mechanisms. In 1883, the British brought coffee to Kenya from Reunion Island. In 1922, Kenya established the Scott Agricultural Laboratory (SL28 and SL34 were named after it) to conduct coffee cultivation research. Within the first decade of its establishment, the laboratory selected SL28 and SL34 from 42 coffee varieties as the most suitable for cultivation in the region, providing an excellent foundation for the coffee industry's development.

2. Government Emphasis. In 1931, the Kenya Growers Cooperative Union and the Kenya National Coffee Committee were established to guide coffee industry development from both the civil and national levels. In 1937, the Nairobi Coffee Exchange was established, initiating Kenya's coffee auction system.

3. Determination of Grading System. Kenya classifies coffee grades based on bean size and cupping results. According to bean size, shape, and hardness, the grades from highest to lowest are AA or AA+, AB, PB, C, E, TT, and T. For AA and AB grade green coffee beans, special grading based on cupping results has been added (not officially recognized by the Kenyan government but established by exporters), ranging from highest to lowest: TOP, PLUS (+), and FAQ.

4. K72 Processing Method. The characteristic acidity of Kenyan specialty coffee is closely related to its exceptional processing method. In typical washed processing, ripe coffee cherries are selected, the pulp is removed, and they are soaked in fermentation tanks to remove mucilage, a process rarely exceeding 36 hours. Kenyan fermentation, however, lasts up to 72 hours. Afterwards the beans are dried until they reach 12% moisture content. FrontStreet Coffee believes that Kenya's unique washed processing method better brings out the bright acidity and full-bodied juice sensation in Kenyan coffee beans.

Kenya Coffee Grading System

AA Plus (AA+): AA grade beans with exceptionally excellent cup quality (flavor, mouthfeel).

AA: Bean size (Screen Size) 17-18 mesh.

AB: Bean size (Screen Size) 15-16 mesh, representing the majority of production.

C: Bean size (Screen Size) smaller than AB.

TT: Lighter-weight beans screened from AA and AB grade beans using air classifiers.

T: Lighter-weight beans screened from C grade beans using air classifiers.

E Elephant Bean: Large mutant beans where two beans have merged, also known as elephant ear beans.

PB Peaberry: Classified by shape, unrelated to flavor or weight.

For AA and AB grade green coffee beans, special grading based on cupping results has been added (not officially recognized by the Kenyan government but established by exporters), ranging from highest to lowest: TOP, PLUS (+), and FAQ. The Kenya Assalia flavor grade on FrontStreet Coffee's bean list reaches the TOP level. As mentioned earlier, this is not an officially recognized grading system. Many of the Kenyan beans FrontStreet Coffee sources from different regions don't necessarily carry flavor grades, so there's no need to be overly concerned about this aspect. Generally, beans reaching AA and AB grades are already considered to have excellent quality by default.

Kenya Coffee Growing Regions

Kenya's coffee growing regions are mainly distributed in the central and western parts of the country. Major coffee regions in the central area include Kiambu, Nyeri, Kirinyaga, Muranga, Embu, Machakos, Ruiri, and Thika. In the west, there are Kisii and the Bungoma district on Mt. Elgon.

FrontStreet Coffee periodically updates the coffee regions on its bean list, and Kenya is no exception. Last month, FrontStreet Coffee sourced a batch of Kenyan beans from different growing regions. Through roasting, cupping, and pour-over brewing evaluations, we found that each region has its own unique character. The specialty coffee regions come primarily from the following areas: Nyeri, Kirinyaga, and Murang'a.

Nyeri

The Nyeri region, in central Kenya, is home to the extinct Mount Kenya volcano. The red soil here nurtures Kenya's finest coffee. Agriculture is extremely important in the region, with coffee as the primary crop, and smallholder cooperatives are more common than large estates.

Altitude: 1,200 to 2,300 meters

Harvest Period: October to December (main season), June to August (secondary season)

Varieties: SL-28, SL-34, Ruiru 11, Batian

Muranga

The Muranga region belongs to the Central Province and has approximately 100,000 coffee farmers. This inland region was one of the first areas chosen by missionaries for settlement, because the Portuguese prohibited them from living in coastal areas. It is another region benefiting from volcanic soil, with more smallholder coffee farmers than large estates.

Altitude: 1,350 to 1,950 meters

Harvest Period: October to December (main season), June to August (secondary season)

Varieties: SL-28, SL-34, Ruiru 11, Batian

Kirinyaga

The Kirinyaga region sits on the slopes of Mount Kenya, adjacent to Nyeri. It is renowned worldwide for coffee with intense flavors, rich layers, and a solid mouthfeel and, together with Nyeri, is recognized as one of Kenya's two most outstanding regions. Most producers here are small-scale farmers who join cooperatives. These cooperatives play a coordinating role, providing washing stations where farmers send their coffee cherries for processing.

Altitude: 1,300 to 1,900 meters

Harvest Period: October to December (main season), June to August (secondary season)

Varieties: SL-28, SL-34, Ruiru 11, Batian

In addition to the regions above, the Thika region, home to FrontStreet Coffee's Little Tomato variety on our bean list, also produces abundant specialty coffee. This particular bean undergoes the 72-hour washed process and consists of the SL-28 and SL-34 varieties. It shows distinct floral notes and a juice-like sensation, making it a daily coffee choice for many enthusiasts.

FrontStreet Coffee's Kenya Little Tomato Coffee Beans

Region: Thika, Kenya

Processing Station: Assalia

Processing Method: Washed processing

Altitude: 1,550-1,750 meters

Varieties: SL28 & SL34

FrontStreet Coffee recommends pour-over brewing as the extraction method.

Brewing Recipe

Coffee Dose: 15 grams

Ratio: 1:15

Water Temperature: 89-92°C

Time: 2 minutes

Grind: EK43S #10

Start with a 30-gram bloom for 30-35 seconds, then pour to 125 grams in about 1 minute. When the water level drops to halfway, pour the remaining water, completing the pour between 1:30 and 1:40. Remove the dripper after 2 minutes of filtration.

Flavor Description: Distinct berry notes, dark cocoa, viscous texture, medium-high acidity, medium bitterness, clean finish, medium-length aftertaste.

FrontStreet Coffee Recommendation

Kenya and Ethiopia sit side by side in East Africa, and if you want to trace how much a single variable, the variety, changes the cup, tasting across both is illuminating. FrontStreet Coffee's washed Yirgacheffe is the classic entry point: clear jasmine florals with a bright citrus acidity, a light and elegant body, and a tea-like finish that reads almost like clean lemon tea.

For a broader tour of how smallholders shape Ethiopian coffee, look to FrontStreet's Guodingding Cooperative lot, where roughly 300 farmers established an independent cooperative in 2012 at the southeastern edge of Yirgacheffe. Because the fruit is depulped before drying, the coffee's own aromatics come through with unusual clarity, layering citrus and lemon over elegant white florals; a light-to-medium roast brings out green tea and honey tones and suits pour-over, cold brew, or espresso.

Those who prefer a fuller fruit profile can try FrontStreet's natural Red Cherry Yirgacheffe, with peach, cocoa, honey, and lemon, or the wilder Kaffa Forest coffee from Ethiopia's southwest, grown on shaded slopes between 1,400 and 2,100 m. Together these lots show the range of East African flavor, from the structured, tea-like Kenyan cup to the fruit-forward sweetness of a natural.