Is Kenyan Coffee Good? AA Grades, SL28 and What to Buy
Kenyan coffee has a reputation for bright, juicy cups, and the labels on the bag, from AA to SL28, tell you more than you might think. About an 8-minute read.
Yes, Kenyan coffee is among the most respected origins in specialty coffee, known for bright, juicy acidity and flavors like citrus, berry and brown sugar. Much of it comes from high-altitude farms around Mount Kenya, is washed, and is grown from varieties like SL28 and SL34 that rate highly for cup quality. AA on the bag means large beans, which is a size grade and not a flavor score.
You see "Kenya AA" on a coffee menu or a bag, usually at a higher price, and the description promises grapefruit or blackberry. It's fair to wonder whether Kenyan coffee is really that good, and what all those letters and numbers mean. This guide answers both.
Kenya is a smaller producer than Brazil or Colombia, but its coffee has an outsized reputation in specialty coffee. Roasters seek it out for its bold, fruit-forward acidity.
Below we explain what Kenyan coffee tastes like, decode the grades and varieties on the label, look at where and how it's grown, and point to Kenyan coffees on our site.
Is Kenyan coffee good?
Kenyan coffee is widely considered some of the best in the world, especially if you like bright, fruity coffee. High altitude, careful washed processing and prized varieties like SL28 and SL34 give it intense acidity and clear fruit flavors. If you prefer low-acid, chocolatey coffee, a Kenyan may taste too sharp for you.
Quality is the reason roasters pay a premium. World Coffee Research rates both SL28 and SL34, the classic Kenyan varieties, as having exceptional cup quality potential at high altitude. Those trees are grown at elevations that commonly reach 1,400 to 2,200 meters (about 4,600 to 7,200 feet), which slows cherry ripening and builds flavor.
The catch is taste preference. Kenyan coffees are lively. If your favorite cup is a smooth dark roast with cream, start with a medium-roasted Kenyan or a blend that includes one.
What does Kenyan coffee taste like?
Kenyan coffee usually tastes bright and juicy, with citrus, berry and stone fruit over a brown sugar sweetness. Across the four Kenyan coffees in our catalog, three roasters list a citrus note such as lemon or grapefruit, three list brown sugar, and two list a berry. Body tends to be medium and the finish clean.
Here's what each roaster lists. Coffee Bros. names sugary plum, chocolate and lemon. Onyx Coffee Lab names grapefruit, brown sugar, kumquat and mulling spice. Hayman Coffee names brown sugar, passion fruit, blackberry and toffee. 8th & Roast names citrus, brown sugar and berry.
That acidity is the signature. In coffee, "acidity" describes a bright, mouthwatering quality like biting into fruit. Sourness from an under-extracted brew is a different thing. Our guide to coffee tasting notes (Lesson 01) explains how roasters come up with notes like these.
What does AA mean on Kenyan coffee?
AA is Kenya's top size grade. It means the green beans passed over screen size 17 to 18, the largest standard sorting screens, so the beans are big and uniform. Kenyan grades are based on bean size alone, not on a taste score, so an AA coffee isn't guaranteed to taste better than an AB.
Coffee screens are measured in 64ths of an inch, so screen 18 is about 7.1 mm. Kenyan mills sort beans by size before export, and lots are sold under those grade codes.
| Grade | What it means | Notes |
|---|---|---|
| AA | Largest beans, screen 17–18 | Most famous grade, usually priced highest |
| AB | One size smaller than AA | Often close in cup quality, usually cheaper |
| PB | Peaberry: one round bean per cherry instead of two | Sorted separately, small share of the crop |
| C and smaller | Smaller beans | Less common in specialty bags |
AA and AB definitions from TYPICA; peaberry grade from the 1Zpresso Kenya guide, citing the Nairobi Coffee Exchange.
Size does tell you something. Coffee platform TYPICA notes that larger beans tend to mature longer on the tree and roast more evenly, which can help show off Kenyan acidity. But its quality team reports that AA and AB lots from the same washing station usually score within about 0.25 points of each other, while AB typically sells for about US$0.50 less at export price. An AB can be a smart buy.
What are SL28 and SL34?
SL28 and SL34 are Arabica varieties selected in Kenya in the 1930s at Scott Agricultural Laboratories, which is where the "SL" comes from. Both are prized for exceptional cup quality and are behind much of Kenya's reputation. Both are also low to medium yielding and vulnerable to major coffee diseases, which makes them harder to grow.
According to World Coffee Research, SL28 was selected in 1935 from a single drought-tolerant tree collected in what is now Tanzania, and it has a Bourbon-related background. SL34 came from a single tree on the Loresho Estate in Kabete in the late 1930s, and recent genetic tests link it to the Typica group.
Ruiru 11 and Batian
Kenya bred newer varieties to fight coffee berry disease. After a 1968 epidemic cut national production by 50%, Kenya's Coffee Research Foundation released Ruiru 11 in 1985. Batian followed in 2010. Both resist coffee berry disease, and World Coffee Research rates Batian's high-altitude quality potential as very good. Many Kenyan lots mix several of these varieties.
| Variety | Origin | Cup quality | Disease |
|---|---|---|---|
| SL28 | Selected 1935, Scott Labs; Bourbon-related | Exceptional at high altitude | Susceptible to rust and berry disease; drought tolerant |
| SL34 | Selected late 1930s, Scott Labs; Typica-related | Exceptional at high altitude | Susceptible to rust and berry disease |
| Ruiru 11 | Released 1985, Coffee Research Foundation | Rated good at high altitude | Resistant to berry disease, tolerant of rust |
| Batian | Released 2010, Coffee Research Foundation | Very good at high altitude | Resistant to berry disease, intermediate rust resistance |
Source: World Coffee Research Arabica variety catalog.
SL28 and SL34 have traveled. SL28 is also grown in Malawi, Uganda and Zimbabwe and has spread to Latin America. One of the Kona coffees on our site, from Hula Daddy, is grown from SL34.
Where is coffee grown in Kenya?
Most of Kenya's best-known coffee comes from the highlands around Mount Kenya, in counties like Nyeri, Kirinyaga, Murang'a, Kiambu and Embu. Farms there typically sit between about 1,300 and 2,200 meters. Because Kenya has two rainy seasons, many regions get a main harvest and a smaller second one.
| Region | Typical altitude | Main harvest |
|---|---|---|
| Nyeri | 1,600–2,000 m | October–December |
| Kirinyaga | 1,300–1,900 m | October–January |
| Murang'a | 1,500–1,900 m | October–December |
| Kiambu | 1,500–2,100 m | September–December |
| Embu | 1,500–2,000 m | October–December |
Source: 1Zpresso, A Guide to Kenyan Coffee.
Nyeri and Kirinyaga show up most often on specialty bags, including three of the four Kenyan coffees we list. The region name is usually followed by the washing station or cooperative that processed the lot, such as Kamwangi or Kamunyaka.
How is Kenyan coffee processed?
Most Kenyan specialty coffee is washed. Cherries are pulped, fermented to loosen the sticky fruit layer, washed, and then often fermented or soaked a second time before drying. This extra step is part of why Kenyan coffees taste so clean and sharply defined.
The Kenyan sequence runs like this: pulping, a first fermentation, washing, a second fermentation or soak in clean water, a final wash, then drying and milling. Washing removes the fruit before drying, so the flavor leans on the bean itself, its variety and its altitude, more than on fermentation.
Some Kenyan naturals and experimental lots do exist, but they are the exception. For a refresher on how washed, natural and honey processes differ, see origin, processing and roast (Lesson 02).
How should you brew Kenyan coffee?
Kenyan coffee shines in pour-over and drip, where a paper filter gives clarity and lets the citrus and berry notes stand out. Light to medium roasts show the most fruit. It also makes excellent iced coffee brewed hot over ice. As espresso, its acidity can be intense, so it's usually better in milk drinks.
Start with your usual recipe and adjust from there. If the cup tastes too sour, grind a little finer or brew a little longer. If it tastes harsh or drying, go coarser. Our beginner home brewing guide (Lesson 03) has ratios and a simple method.
Roast level changes the experience a lot. On our site, 96% of light roasts list fruit notes compared with 42% of dark roasts, according to our coffee by the numbers report (Lesson 05). A dark-roasted Kenyan loses much of what makes it special.
Kenyan coffees to try
We picked every Kenyan coffee in our catalog, plus a Kona coffee grown from the Kenyan SL34 variety. They range from AA to AB and from light to light-medium roasts. Tasting notes are the roasters' own. All four Kenyans are washed, so expect the clean, bright profile described above.
Coffee Bros. Kenya AA – Kirinyaga
A light-medium roast, washed AA from Kirinyaga. The roaster lists sugary plum, chocolate and lemon. A good first Kenyan, since the chocolate softens the acidity.
Onyx Coffee Lab Kenya Kamunyaka AA
An AA lot from the Kamunyaka station. The roaster lists grapefruit, brown sugar, kumquat and mulling spice. It suits pour-over drinkers who want classic Kenyan citrus.
Hayman Coffee Kenya Kamwangi AA – Kirinyaga
A washed AA from Kirinyaga. The roaster lists brown sugar, passion fruit, blackberry and toffee. A pick for fans of juicy, tropical fruit with a sweet finish.
8th & Roast Kenya Rita AB
A light roast, washed AB from Nyeri. The roaster lists citrus, brown sugar and berry. It's a good way to see that an AB grade can deliver the full Kenyan experience.
Hula Daddy Kona Coffee Laura's Reserve SL 34
SL34, the Kenyan variety, grown in Kona, Hawaii. The roaster lists caramel, nutty and sweet. It shows how the same variety can taste very different in another place, and suits drinkers who want a gentler cup.
Frequently asked questions
Is Kenya AA better than AB?
Not necessarily. AA and AB are size grades, not taste scores. TYPICA's quality team reports AA and AB from the same washing station usually score within about 0.25 points, and AB typically costs less.
Why is Kenyan coffee so acidic?
High altitude, washed processing with an extra soak, and varieties like SL28 and SL34 all favor bright, fruity acidity. In coffee, acidity means a lively, juicy taste, and lighter roasts keep more of it.
What does SL stand for in SL28?
SL stands for Scott Agricultural Laboratories, the Kenyan research station where SL28 and SL34 were selected in the 1930s. The number refers to the individual selection.
Is Kenyan coffee good for espresso?
It can be, but its acidity can taste sharp as a straight shot. Many people enjoy it more in milk drinks, or brewed as pour-over or drip where the fruit notes stay clear.
Does Kenyan coffee have more caffeine?
Kenyan specialty coffee is Arabica, and we found no reliable data showing it has more caffeine than other Arabica coffees. How much coffee you use and how you brew it matter far more.
Sources: World Coffee Research, SL28 variety profile · World Coffee Research, SL34 variety profile · World Coffee Research, Ruiru 11 variety profile · World Coffee Research, Batian variety profile · TYPICA, Is Screen Size a Quality Indicator? Tips for Sourcing Kenyan Coffee · 1Zpresso, A Guide to Kenyan Coffee