How do altitude and coffee bean process shape Colombian coffee?

Colombia's low-latitude, high-altitude terrain supports coffee growth across varied microclimates, which is why the country is a major specialty origin. Main planted varieties include Caturra and Castillo, with smaller amounts of Geisha and Bourbon. Washed, semi-washed, anaerobic natural, and anaerobic enzyme-washed methods all appear, and each one changes the flavor in the cup.

Southern regions such as Huila, Cauca, Nariño, and Tolima differ in soil and climate, so the same variety can taste unlike itself from one area to the next. Colombian beans suit many coffee bean process options, and the classic profile is a solid body with nut, chocolate, and caramel aromas and smooth fruit acidity.

Colombia, with its low-latitude, high-altitude diverse terrain, has become an important origin for specialty coffee. This article systematically reviews the characteristics of the country's main cultivated varieties such as Caturra, Castillo, Pink Bourbon, and Geisha, explains in detail the terroir differences of southern specialty regions including Huila, Cauca, Nariño, and Tolima, and introduces how processing methods such as washed, semi-washed, anaerobic natural, and anaerobic enzyme-washed shape flavor. The seven Colombian beans launched by Front Street Coffee include Rose Valley, Flower Moon Night, and everyday beans, and the article also provides roasting curves, cupping performance, and V60 three-stage brewing parameters, offering coffee enthusiasts a complete reference from understanding the origin to practical brewing.

Colombia has complex and varied terrain, and being located in a low-latitude, high-altitude region creates uniquely favorable natural conditions for growing specialty coffee. Front Street Coffee currently offers a total of 7 Colombian beans, which also shows how favored this country's origins are in the market. In recent years, special processing methods have become widespread, and Colombian coffee beans happen to be suited to a variety of processing methods, so the flavor expression of the finished products has become rich and diverse, and of course controversy has followed, though this is not within the scope of Front Street's discussion. In Front Street's view, the most authentic flavor of Colombian origins should be a solid mouthfeel, relatively high body, aromas such as nuts, chocolate, and caramel, pleasant and smooth fruit acidity, and a balance among acidity, bitterness, and sweetness that is just right.

Coffee varieties cultivated Colombian coffee mainly grows Caturra and Castillo, with a small amount of Geisha and Bourbon as well.

Caturra: Caturra is a natural mutation in the Bourbon line of Arabica, first discovered in Brazil in 1937. Compared with Bourbon, its plant is shorter and the tree is not tall. Because it inherits Bourbon's lineage, Caturra has relatively weak disease resistance, but its yield is better than Bourbon's. Interestingly, although Caturra was first discovered in Brazil, the local climate was not suitable for it, so Brazil did not promote large-scale cultivation, while it instead became widely popular in Central and South America, with sizable Caturra plantations in countries such as Colombia, Costa Rica, and Nicaragua.

Castillo: Castillo is the most widely planted coffee variety in Colombia, and its popularity is mainly due to its good reputation for resistance to leaf rust. Starting in 1961, Cenicafe began researching the Timor variety, which carries Robusta lineage, and research continued thereafter; in 2002 it released its second disease-resistant variety, Tabi (a hybrid descendant of Typica, Bourbon, and Timor), and in 2005 it released Castillo, by far its most successful disease-resistant variety. After the large-scale outbreak of leaf rust in 2008, Colombia began vigorously promoting the cultivation of Castillo.

Pink Bourbon: As its name suggests, the coffee cherries of Pink Bourbon take on a romantic pink hue after ripening. This is a fairly rare new variety, bred from a cross between Red Bourbon and Yellow Bourbon. It is rare mainly because it is very difficult to stably maintain this beautiful pink color; sometimes the harvested fruit turns into Orange Bourbon, because the final color of the coffee fruit is determined by recessive genes in the pollen grains. Among the pollen grains selected for crossing, some may carry the yellow gene偏向 Yellow Bourbon and some may carry the red gene偏向 Red Bourbon, and these are all recessive genes that easily interfere with one another.

Geisha: Although Geisha's flavor is exquisite, this elegance does not come from nowhere, but from a specific growing environment. Geisha This variety is quite demanding about growing conditions, requiring high altitude, cloud cover or abundant shade trees, and fertile soil in order to be planted. Geisha grown at high altitude produces coffee with obvious floral aromas and refined, elegant fruit acidity, which is one reason it has become popular around the world. Colombia's Geisha cultivation has some connection to Panama's Hacienda La Esmeralda. As early as 2007, Hacienda La Esperanza first purchased Finca Kalida next to Hacienda La Esmeralda, practiced and learned Geisha cultivation techniques there, and after mastering them transplanted Geisha seedlings back to areas at 1,700 to 1,950 meters with large day-night temperature differences and rich microclimates; these Geisha can be said to be the early "descendants" transplanted from Finca Kalida beside Hacienda La Esmeralda. Coffee-growing regions

Colombian coffee is best known for regions such as Medellin, Armenia, and Manizales, conventionally grouped together as "MAM." Specialty bean regions are concentrated in the south, mostly above 1,500 meters, including San Augustin in Huila, Popayan in Cauca, Nariño, and Tolima. Coffee from these places generally has refined acidity and berry aromas, accompanied by caramel-like sweetness, with a prominent sweet impression.

Huila: Huila is located in the southern section of Colombia's Central Cordillera in the south of the country and is the country's most famous specialty coffee region. Surrounded by mountains, the terrain is mainly hilly, with cultivation at altitudes above 1,500 meters; Colombia's most important rivers converge here, bringing abundant water resources and moisture. Unlike the common impression of mass-market Colombian coffee as balanced and smooth, many Colombian specialty beans produced in smallholder micro-lots actually have strong regional flavor characteristics. In recent years, as the international market's demands for coffee quality and specialty coffee have risen, the area has gradually abandoned its former system of grading by bean size and shifted instead to micro-regional selections organized by smallholder coffee producers, with dozens of smallholders pooling their individual harvests into a single micro-lot for sale, thus creating more opportunities through lot-by-lot cupping to directly select many specific smallholder coffees of excellent quality.

Cauca: Cauca is a region certified under Colombia's coffee denomination of origin, with an average altitude of 1,758 meters, rising as high as 2,100 meters. The area's terrain, rainfall, temperature, and volcanic soil provide suitable conditions for coffee growing. Of its territory, 80% is mountainous, with parallel mountain ranges in the east and center that are part of the Andes; the central range contains two major volcanoes, Sotara and Petacas. Like other southwestern regions, Cauca shows a clear monomodal rainfall distribution, with the dry season mainly occurring from August to September each year, after which the rainy season brings a concentrated coffee flowering period, followed immediately by the concentrated coffee harvest season the next year.

The biggest climatic difference from other regions is probably the relatively large temperature variation: the average daily temperature is 11°C, while the average daytime temperature is 18°C. The day-night temperature difference is an important factor in producing high-quality coffee. Low nighttime temperatures combined with relatively higher altitude slow the pace of coffee growth, allowing the coffee seed and bean to absorb nutrients from the coffee fruit more fully, and also creating Cauca coffee's better acidity and much-praised unique sweetness.

Nariño: Nariño is located in southwestern Colombia, bordered by the Pacific Ocean to the west and Ecuador to the south, with the Andes running through the entire department. Coffee is grown at 1,600 to 2,300 meters in the high-altitude cloud belt, and the soil is fertile volcanic geology; the beans are small but plump and emerald green in color. The vast majority of Nariño's annual production is purchased by large U.S. bean traders. Nariño is located in southwestern Colombia, bordered by the Pacific Ocean to the west and neighboring Ecuador to the south, with the Andes running through the department; it has majestic mountains and beautiful scenery, and several rivers flow through the area toward the south. It belongs to Colombia's high-mountain coffee-growing zone and has nurtured many small specialty coffee producers. Nariño's total annual production is about 150,000 bags, of which only about 6,000 bags are specially selected beans.

Tolima: Tolima is adjacent to Huila and Cauca, with the north-south-trending Andes (M. Andes) and Cordillera (M. Cordillera) running through it, and between these two famous mountain systems runs the Magdalena River (R. Magdalena) from south to north. The name Tolima comes from the "Pijao people" who first lived here; in this ancient group's language (Pijao word), tolima means "snowed," "covered with snow." Tolima's farms are generally slightly larger than those in other southern Colombian regions, at about 10 to 15 hectares. Cooperative models are also common here, with farmers sending their own small batches of coffee cherries to the cooperative's processing plant. Some farmers also choose to process it themselves, using their own small-scale facilities capable of handling the day's harvest. Coffee bean processing methods The processing methods used for Colombian coffee beans are diverse, with anaerobic processing and washed processing predominating.

Washed processing: Coffee farmers first pour the harvested coffee cherries into a large water tank; underdeveloped, inferior beans float to the surface, while ripe, plump fruits sink to the bottom, and at this point the defective beans (fruits) floating on the surface are removed. Then the outer skin and pulp of the coffee fruit are removed with a pulper, and at this stage a slippery layer of mucilage still clings to the surface of the coffee beans. The mucilage-covered coffee beans are placed in a fermentation tank for 16 to 36 hours, during which microorganisms break down the mucilage. After fermentation is complete, the remaining mucilage on the beans is rinsed off thoroughly with plenty of clean water. Finally, the washed coffee beans are dried. Front Street believes that the washed processing method can have both gentle and intense acidity, body that is neither too strong nor too light, and sweet, spicy aromatics.

Semi-washed method: Semi-washed is only suitable for certain specific areas of Colombia, where the local climate has a fairly long dry period that makes it possible to process coffee this way. Coffee processed by this method is all sticky, and the mucilage does not disappear through fermentation in a tank. Therefore, coffee produced by this semi-wet processing method contains characteristics of both wet processing and dry processing. Front Street believes that semi-washed coffee is quite good in acidity, sweetness, seasoning, and aroma; the only drawback is that such coffee's flavor is not as intense as that of purely natural or washed coffee.

Anaerobic natural: The whole coffee cherry is first subjected to anaerobic fermentation, then processed as natural. Basically, the anaerobic process makes the coffee more uniform and easier to monitor; the aerobic process is more complex and harder to monitor. In an anaerobic environment, the breakdown rate of sugars in the mucilage is slowed, and the pH value falls more slowly, so fermentation time can be extended, thereby developing better sweetness and a more balanced flavor. The temperature controlled during anaerobic fermentation must be below 10 to 15 degrees, and in a sealed, clean stainless steel fermentation vessel the coffee beans ferment for three days under oxygen-free conditions.

Anaerobic enzyme-washed: Anaerobic enzyme-washed removes defective coffee beans through washing, and finally the processed coffee beans are placed in a sealed container, into which carbon dioxide is injected to expel oxygen; in an oxygen-free environment, the breakdown rate of sugars in the coffee mucilage is slowed, and the pH value also falls more slowly, extending fermentation time so as to develop better sweetness and a more balanced flavor in the coffee.

Anaerobic double enzyme-washed: On the basis of anaerobic washed, special enzymes are added for a second anaerobic fermentation. After the coffee fruit is removed from the anaerobic environment, the skin and pulp are removed by machine, and then the mucilage-covered coffee beans are placed in a plastic bag or another sealed container in an anaerobic environment for one anaerobic fermentation. The processing method that undergoes the above two anaerobic fermentations is called double anaerobic fermentation.

The 7 coffee beans launched by Front Street Coffee are Colombian Rose Valley coffee beans, Colombian Flower Moon Night coffee beans, Colombian Cherry Blossom coffee beans, Colombian San Jose barrel-processed coffee beans, Colombian Isabella Pink Bourbon coffee beans, Colombian decaf coffee beans, and Colombian everyday beans. Among them, the most popular Colombian coffee beans are Rose Valley, Flower Moon Night, and everyday beans. Front Street's everyday beans are the "face" of origin coffee beans, because their origin's basic flavor is more recognizable, and they are also low-priced, high-value coffee beans. When Front Street Coffee chooses to offer an "everyday bean," it carefully selects from major origins the beans that best represent the local original flavor.

Region: Santander, Colombia

Farm: Big Tree Estate

Altitude: 1700m

Processing method: Anaerobic enzyme-washed

Variety: Caturra

Region: Acevedo Gading Farm, Huila, Colombia

Altitude: 1800m

Processing method: Anaerobic natural

Variety: Caturra

Country: Colombia

Region: Huila

Altitude: 1500-1800 meters

Variety: Caturra

Processing method: Washed processing

Front Street roasting suggestions

[Rose Valley roasting suggestion]

Considering that Colombian Rose Valley uses the double anaerobic washed method, in order to preserve the bean's fruit character and rich acidity while also showing full body and sweetness on the palate, a medium roast profile is used.

Charge temperature: 180°C,

Turning point: 6'00", 151°C

First crack: 9'48", 183.3°C

Develop 2'10" after first crack, drop at 197°C

[Flower Moon Night roasting suggestion]

Considering that Colombian Flower Moon Night uses the anaerobic natural method, in order to preserve the bean's fruit character while also showing full body and sweetness on the palate, a medium roast profile is used.

Charge temperature: 180°C

Turning point: 6'2'', 150.6°C

First crack: 10'20'', 185°C

Develop 1'50'' after first crack, drop at 196°C

[Colombian everyday bean roasting suggestion]

This Colombian Huila bean has relatively high density, uniform screen size, and fairly plump shape. The Front Street roaster wanted to express aromas of nuts, dark chocolate, and caramel, so after first crack the heat was adjusted and the roasting time extended, dropping at 3'00'' and 202°C.

The drum temperature was raised to 185°C for charging, the damper was set to 3, heat to 120, the turning point was 1'32", 98.6°C; when the drum temperature reached 140°C the damper was opened to 4; at this point the bean surface turned yellow, the grassy smell disappeared completely, and the dehydration stage began; when the drum temperature reached 192°C, the heat was adjusted to 80 and the damper opened to maximum 5; at 8'30", ugly wrinkles and dark streaks appeared on the bean surface, and the toast aroma clearly turned into coffee aroma, which can be defined as the prelude to first crack; at this time you need to listen carefully for the sound of first crack, which begins at 9'15"; after first crack, develop 3'00'' and drop at 202°C.

Front Street cupping flavors

[Flower Moon Night cupping flavors]

Dry aroma: berries, nuts, fermented aroma

Wet aroma: berries, strawberry, chocolate

[Rose Valley cupping flavors]

Dry aroma: fermentation, peach, strawberry

Wet aroma: honey, rose, peach

[Colombian everyday bean cupping flavors]

Dry aroma: nuts, spices

Wet aroma: berries, nuts, chocolate, caramel

Front Street Coffee brewing suggestions

Dripper V60

Water temperature 90°C

Dose 15 grams

Coffee-to-water ratio 1:15

Grind size BG#6m (80% passing through China standard No. 20 sieve)

*The grind setting adjustment on BG grinders is very fine, and not all BG grinders can be set the same; the setting used varies with coffee bean altitude and roast level, so Front Street Coffee suggests recalibrating the grinder at regular intervals. To calibrate coffee grind size, you can use a standard No. 20 coffee inspection sieve; if you do not have a sieve at home, Front Street Coffee suggests judging by observing the flow rate: if the flow is too fast, the grind is too coarse, and if the flow is too slow, the grind is too fine.

Front Street Coffee uses staged extraction, also called three-stage brewing: use 30 grams of water for a 30-second bloom, pour in a small stream in circles until 125 grams for the first stage, and when the water level drops and is about to expose the coffee bed, continue pouring until 225 grams and stop; when the water level drops and is about to expose the coffee bed, remove the dripper; the extraction time (starting from the bloom) is 2'00"-2'10". Rose Valley brewed flavor : stunning peach character, accompanied by rose and liqueur chocolate aromas, fragrant and rich, entering the mouth like drinking peach juice. It has both the high-quality sweet-tart sensation of black grapes and a silky mouthfeel like cream toffee.

Flower Moon Night brewed flavor: rich strawberry aroma, strawberry acidity on entry, jam-like sweetness in the middle, a slight cocoa finish, and a juicy mouthfeel. Everyday bean brewed flavor: nuts, dark chocolate, soft fruit acidity in the middle, and caramel sweetness.

For more specialty coffee beans, please add the private WeChat of Front Street Coffee, WeChat ID: kaixinguoguo0925

The above content is compiled by CoffeeHunters, a coffee news website.