Kenya grows almost only arabica, and grades it by bean: AA, AB, PB, C, E, TT and T are set mainly by screen size, density and defects. The Nairobi Coffee Exchange also assesses cup quality, so a grade letter alone does not tell you how a lot tastes. Kenya’s notable varieties include SL28, SL34, Ruiru 11 and Batian.
On the Nairobi Coffee Exchange’s grade list, AA is screen 18 and, in the exchange’s words, the “largest bean size”; E (Elephant) is “very large beans”, which the list does not rank against AA; and PB is peaberry, a cherry that produced one round seed instead of two, which is a shape rather than a size rank. Grading happens after the coffee is grown and processed, so a high grade cannot make a bad lot taste good. The exchange credits high altitude, volcanic soils and distinct varieties for the Kenyan cup, and its grade list sets dry-processed coffee apart as the Mbuni grades MH and ML.
Table of Contents
The Kenyan grade table, as the auction defines it
| Grade | What it means |
|---|---|
| AA | Screen 18. Largest standard bean size; usually the highest auction prices. |
| AB | Screen 16–17. The most commonly traded grade. |
| PB | Peaberry. One round seed instead of two. |
| C | Smaller beans, often blended or sold regionally. |
| E | Elephant. Very large beans. |
| TT | Lighter, less dense beans separated during grading. |
| T | Small or light beans. |
| MH / ML | Mbuni — dry-processed (unwashed) coffee, a different flavour profile. |
A separate class number, assigned on cup, is what actually rates the liquor. Two AA lots from neighbouring washing stations can cup very differently. So “AA” on a bag tells you the beans are big and were carefully sorted; it does not promise the cup, and it is not a reason to pay more on its own.
The varieties, and why Kenya keeps breeding new ones
Kenya grows almost exclusively Arabica. The exchange names four notable varieties, and they split cleanly into the old ones people prize and the new ones that survive.
- SL28 — selected in 1935 at Kenya’s Scott Agricultural Laboratories from “Tanganika Drought Resistant” material with a Bourbon-like background. Tall, low-yielding, and susceptible to leaf rust, coffee berry disease and nematodes (World Coffee Research).
- SL34 — selected from a single tree on Loresho Estate at Kabete, labelled “French Mission”, with a Typica-like background. Tall, medium yield, “exceptional cup quality” but “highly susceptible to coffee berry disease” (World Coffee Research).
- Ruiru 11 — released in 1985 by Kenya’s Coffee Research Foundation (now KALRO) after the 1968 CBD epidemic. Compact, very high yielding, “highly resistant” to leaf rust and “resistant” to coffee berry disease (World Coffee Research).
- Batian — released in 2010 by the same institution. Tall, very large beans, resistant to coffee berry disease and intermediate against leaf rust; WCR describes it as unusually well suited to smallholders for combining tall stature with disease resistance (World Coffee Research).
Arabica reached Kenya through French Spiritan missions: seed from La Réunion was planted at Bura in the Taita Hills in 1893, and seedlings from Bura went to the Saint Austin mission near Nairobi in 1899, from where they spread to settler farms (World Coffee Research). The tree that became SL34 was labeled “French Mission”, a name World Coffee Research says “is widely understood to be another name for Bourbon”; it adds that “recent genetic tests have indicated that SL34 is related to the Typica genetic group”, so the label may be wrong (WCR, SL34).
A short history of coffee in Kenya
| Year | What happened | Source |
|---|---|---|
| 1893 | French Spiritan missionaries found a mission at Bura, in the Taita Hills, and plant Bourbon seed from La Réunion | WCR, SL34 |
| 1899 | Seedlings from Bura go to the Saint Austin mission near Nairobi, and seed from there to settlers | WCR, history of arabica |
| 1935 | The first coffee auction is held, in September | NCE, history; USDA |
| 1935 | SL28 is selected at Scott Agricultural Laboratories | WCR, SL28 |
| 1968 | A coffee berry disease epidemic costs “50% of Kenya’s production” | WCR, Ruiru 11 |
| 1985 | Ruiru 11, bred to resist coffee berry disease, is released | WCR, Ruiru 11 |
| 2010 | Batian is released | WCR, Batian |
| 2023 | Marketing agents are abolished, and payments for exchange sales must run through the Direct Settlement System | USDA, 2024 annual |
| 2026 | The Coffee Act transitions oversight from the Agriculture and Food Authority to the revived Coffee Board of Kenya | USDA, 2026 annual |
Where it grows
Coffee grows mainly in Kenya’s central highlands and the Rift Valley — Nyeri, Kirinyaga, Murang’a, Kiambu, Embu and Meru counties among others — at roughly 1,400–2,100 m in volcanic soils, with distinct wet and dry seasons (Nairobi Coffee Exchange). Altitude and soil are the levers that matter here: slow cherry development at elevation is what builds the acidity Kenyan coffee is bought for.
How is Kenyan coffee sold?
Most Kenyan coffee moves through cooperatives and the auction. The USDA Foreign Agricultural Service’s May 2026 Kenya Coffee Annual reports that “Roughly 80 percent of Kenya coffee is sold through producer co-operatives“, with estates handling the rest, and that the Nairobi Coffee Exchange, “a spot market founded in 1935, facilitates over 95 percent of coffee sales“; the rest goes through direct contracts. It estimates the 2025/26 crop at 850,000 60-kilogram bags and forecasts 950,000 for 2026/27 (USDA FAS, Kenya Coffee Annual, KE2026-0011); its 2024 annual counted about 550 cooperatives marketing over 80 percent of the crop.
In July 2023 the Kenyan government abolished marketing agents and banned businesses from holding multiple licences along the value chain. Payments for coffee sold through the exchange now run through a Direct Settlement System managed by the Cooperative Bank of Kenya; broker licensing moved to the Capital Markets Authority; milling licensing moved to county governments. USDA reports that the reforms also ended the input, extension and certification programmes the de-licensed agents used to run, and that several large millers stopped operating under the new licensing rules (USDA FAS, Kenya Coffee Annual, report KE2024-0003). The 2026 annual adds that “In March 2026, Kenya enacted the Coffee Act”, which “transitions regulatory and commercial oversight from the Agriculture and Food Authority to the revived Coffee Board of Kenya”, and that licensed brokers “have taken over the tasks of classifying coffee, preparing sale catalogues, and managing both auction and direct sales”. If you buy Kenyan coffee, that is the machinery your bag came through.
What Kenyan coffee tastes like — and what nobody can promise you
Washed Kenyan Arabica is bought for high, structured acidity and a heavy body; blackcurrant is the descriptor traders reach for most often. We have not cupped a panel of Kenyan lots ourselves, so this page will not publish tasting scores or invent notes for a specific coffee. Treat the roaster’s own cupping notes on the bag as the claim that actually applies to what you bought — and note that Ruiru 11 and Batian lots, bred for survival rather than for the cup, can taste noticeably different from an SL28/SL34 lot from the same county.
Brewing it
Start at 55 g of coffee per 1 litre of water — about 1:18 by weight. That is the standard brew ratio specified in SCA Standard 310-2021, Home Coffee Brewers, which defines it as “55 g of coffee per 1.000 kg of water” and requires brewers to print that ratio in their instructions. Stronger means more coffee, not less: at 1:15 you are using more grounds per litre than at 1:18, not fewer. Note that a “cup” in coffee measurement is 6 fl oz, not 8 — most kitchen confusion about dosing starts there.
For water temperature, see our page on the best temperature for French press coffee, which states the range with its source rather than repeating it here. Pour-over suits Kenyan coffee’s acidity; a medium-fine grind and a steady, slow pour is the whole technique. A gooseneck kettle with a built-in thermometer makes the pour and the temperature controllable at the same time.
Affiliate disclosure: the product link in this section is a paid link. As an Amazon Associate I earn from qualifying purchases. It costs you nothing extra. We have not tested this kettle; it is listed because a gooseneck spout and a built-in thermometer are the two features that matter for pour-over, not because we compared it against others.
Barista Warrior gooseneck kettle with thermometer on Amazon
Buying Kenyan coffee
- Roast date, not a “best before” date. If the bag will not tell you when it was roasted, that is the answer.
- A named region, cooperative or washing station — Nyeri, Kirinyaga, Embu and so on. “Kenya AA” alone tells you only the screen size.
- Variety, if it is stated. SL28 and SL34 are what most specialty buyers are chasing; Ruiru 11 and Batian are increasingly common and are not a defect.
- Certification claims should name the scheme and, ideally, the certificate holder. A certification logo without a named scheme is a design element.
Other East African origins on this site
Kenya is one of five East African origins we cover, and each is a genuinely different crop rather than a regional variation on this one. Ethiopian coffee is arabica’s centre of origin, sold under regional names — Yirgacheffe, Sidamo, Guji, Harar, Limu, Jimma — three of which, Harar, Sidamo and Yirgacheffe, Ethiopia holds as registered trademarks in Canada, the EU and the US. Rwandan coffee is mainly Bourbon and mostly fully washed, grown by roughly 400,000 smallholder families on just over 42,000 hectares. Tanzanian coffee splits between arabica in the north around Kilimanjaro and the south around Mbeya, and robusta grown almost entirely in Kagera by Lake Victoria. Ugandan coffee is the mirror of Kenya’s profile: about 84 per cent robusta, and the fourth-largest robusta producer in the world behind Vietnam, Brazil and Indonesia. See also roast levels if you are deciding how dark to buy any of them.
Corrections to earlier versions of this page
An earlier version of this page got several things about Kenyan grading wrong:
- It listed E among the “smaller beans”. E is Elephant: the Nairobi Coffee Exchange’s own grade list defines E as “very large beans”.
- It treated PB as a size rank between AB and C. PB is peaberry: “small round beans formed when only one seed develops in the cherry” (Nairobi Coffee Exchange). It is a fruit-set outcome, not a position on a size ladder.
- It said grading “significantly influences their taste and quality”. That reverses cause and effect. The exchange describes grading as sorting “by screen size, defect count, and quality” — quality is an input to the grade, not a product of it.
- It called SL28 and SL34 disease-resistant. They are the opposite. World Coffee Research rates SL28 as “low resistance/susceptible” to coffee leaf rust and “susceptible” to both coffee berry disease and nematodes, and gives SL34 the same three ratings. Their susceptibility is exactly why Kenya bred Ruiru 11 and Batian, neither of which this page used to mention.
- It cited a “National Geographic Article” on Kenyan coffee flavour, an International Coffee Organization “report”, and a “Fair Trade Article” — all three links pointed at bare homepages, not at any article making those claims. They have been removed and replaced with sources that say what this page says they say.
Also corrected: an earlier version said the grades “describe the bean, not the flavour in the cup”, although the exchange lists cup quality among the factors that set a grade; it said E “is larger still” than AA, which the exchange’s list does not state; it said the “French Mission” label on SL34 is “a direct descendant” of the 1893 introduction, which WCR says may be wrong; it said four varieties “account for most of” Kenya’s coffee and that almost every Kenyan mill uses washed processing, neither of which we could source; it called Rwandan coffee almost entirely Bourbon; and it gave the exchange’s share as over 90 percent and the cooperatives’ as over 80 percent from USDA’s 2024 annual, where the 2026 annual gives over 95 percent and roughly 80 percent.
