You might see "altitude 1,500m" written in coffee bean product descriptions.
Hearing that beans are grown at high altitudes might give you the impression of superior quality. But does coffee from 1,800m necessarily taste better than coffee from 1,200m?
While altitude is important information for understanding the growing environment, the number alone doesn't determine taste quality.
This time, we'll explore how to interpret altitude, based on research and 0566 Coffee Manufacturing's on-site experience.
Altitude is noteworthy because it relates to temperature
In general, temperatures are lower at higher altitudes. In coffee, low temperatures extend the fruit's maturation period and affect the formation of components, which is a key factor when considering the relationship with quality. [Worku et al., 2018]
However, this doesn't mean "the slower it grows, the better it tastes indefinitely." Altitude is not temperature itself, but one clue for inferring temperature.
When reading product descriptions, rather than hastily concluding "it's high quality because it's X meters," try to use it as an entry point to think, "What kind of environment did it grow in?"
Research doesn't just look at altitude either
A study examining two regions in Costa Rica found a positive correlation between altitude and tasters' preference ratings. At the same time, differences due to slope orientation were also confirmed.
What this research shows is that environmental differences within the same region affect taste. The results cannot be directly applied to all farms worldwide, implying "higher is better." [Avelino et al., 2005]
Not just the height of the mountain, but also which way the slope faces. How does the sun hit it? There are conditions that aren't visible from just the numbers on a map.
A farm at approximately 1,530m on Samosir Island
In August 2026, 0566 Coffee Manufacturing visited Samosir Island in North Sumatra, Indonesia.
The farm we visited in Ronggur Nihuta was at an altitude of approximately 1,530m according to on-site verification. We heard cultivar names like Sigarar Utang and Aten Super.
At the location we observed, there were no shade trees covering the coffee plants, and the terrain ranged from flat to gently sloping.
If this information were reduced to just "altitude 1,530m," the details of the farm would be lost. Even at the same altitude, what we want to verify on-site differs between shaded farms and open farms.
Please note that this is a record of the visited farm and does not represent the cultivation conditions of Samosir Island as a whole.
The heat felt on-site and the coolness of the morning
During our stay, the midday sun was strong, and it felt hotter than expected. In contrast, early mornings were cool, and there were times when mist or low clouds could be seen around the lake.
However, the perceived sensation around the lake and observations over a few days cannot be directly treated as the annual climate of the farm. It's important to differentiate this from continuous temperature and humidity records for the farm.
What we felt during this visit was that we wanted to look at the environment of morning and day, farm and drying area, rather than simply concluding "it's cool because it's a high altitude."
What 0566 wants to know after altitude
When visiting a production area, 0566 wants to know more than just the altitude.
What varieties are planted? When are the fruits picked? After harvesting, who processes them, and where are they dried?
In Samosir, we brought back fully washed, natural, honey, and Sumatra Giling Basah processed beans from multiple processing stations. These were not comparative trials with identical farms and varieties. Therefore, the differences we felt during tasting cannot be explained solely by the effects of altitude or processing.
Nevertheless, by comparing what we heard on-site with the actual beans, we can identify what we want to investigate next. For us, origin information is not a definitive answer that dictates taste, but a clue to deepen our understanding.
When choosing beans, combine altitude with taste descriptions
When selecting a product, don't narrow down your choices based only on the altitude number; also read the taste description and roast level.
"Bright citrus acidity," "gentle sweetness," "bitter aftertaste." Find words that describe a cup you want to drink, and then looking at the origin information will make the numbers feel a bit more familiar.
If you find beans you like, it's also a good idea to remember the origin, variety, processing method, and roast level together.
Altitude is information that allows us to imagine where that coffee grew. 0566 aims to convey the taste of a cup by also looking at the farms and the work of the people beyond that.
References and Field Records
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Worku et al. (2018)Effect of altitude on biochemical composition and quality of green arabica coffee beans can be affected by shade and postharvest processing method
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Avelino et al. (2005)Effects of slope exposure, altitude and yield on coffee quality in two altitude terroirs of Costa Rica, Orosi and Santa María de Dota
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Interviews and observations during 0566 Coffee Manufacturing's visit to Samosir Island in August 2026. Altitude is the confirmed value at the visited points, and climate descriptions are observations and sensations during the stay, not long-term recorded values.
