History & Origins
La Unión is a municipality in the department of Nariño, in the extreme south of Colombia near the Ecuadorian border. Nariño’s geography — a high plateau formed by the volcanic Andes — creates growing conditions unlike any other Colombian origin. The department sits closest to the equator of all Colombia’s major coffee regions yet produces some of the country’s highest-altitude coffees, with farms routinely exceeding 2,000 meters above sea level.
Coffee arrived in Nariño in the early twentieth century, and the region’s smallholder farming tradition has remained largely intact through Colombia’s turbulent agricultural history. La Unión municipality is one of Nariño’s most productive coffee areas, home to thousands of small farming families each managing between one and three hectares. Cooperatives such as COOPAGRO and ASOCAFÉ La Unión have formalized the specialty supply chain, providing farmers with cupping access, agronomy support, and export connections.
Terroir & Growing Conditions
The defining characteristic of Nariño coffee growing is extreme altitude. La Unión’s farms range from 1,800 to 2,300 meters — well above the altitudes typical in other Colombian departments — with the highest plots approaching the upper limit of commercial Arabica cultivation. At these elevations, the equatorial sun provides intense light energy for photosynthesis while cool temperatures (daily averages of 14 to 18 degrees Celsius) slow cherry development dramatically.
The equatorial position means La Unión receives consistent solar radiation year-round with minimal seasonal variation in day length, unlike coffee grown at higher latitudes. This equatorial light combined with high altitude creates a unique growing environment: intense but not hot, with cherry ripening over 10 to 12 months and accumulating exceptional concentrations of sugars and organic acids. Soils are volcanic, well-drained, and rich in minerals, with a texture that varies from sandy loam near the plateau rim to dense clay in the valley interiors.
Processing & Production
Nariño’s washed processing method is nearly universal, with the traditional Colombian beneficio húmedo adapted to the high-altitude context. Due to the cooler temperatures, fermentation times at La Unión tend to run longer than at lower-altitude origins — often 18 to 30 hours — as yeast activity is slower in the cold. Farmers have developed a nuanced understanding of how fermentation progresses at their altitude, adjusting timing based on ambient temperature and cherry ripeness.
After fermentation and washing, parchment is dried primarily on raised beds or on rooftop patios, taking advantage of the intense equatorial sun. The cool air temperatures mean drying can take 20 to 30 days even in full sun. Some farms use covered parabolic dryers to manage the frequent afternoon rains. The milled export parchment from La Unión arrives at Bogotá or Buenaventura for final grading and export, typically shipped between July and October from the April–July harvest.
Cup Profile & Tasting Notes
Nariño coffees from La Unión are renowned for their exceptional brightness and complexity. The acidity is the defining feature: a vivid, wine-like acidity that reads as red grape or ripe cherry, with a citrus backbone of blood orange and lime zest. This acidity is not harsh or aggressive — it is balanced by a full body and pronounced sugarcane sweetness that is distinctly Nariño in character.
The floral component is more restrained than in Yirgacheffe or Guji Ethiopians, but a subtle rose and violet note adds aromatic interest. The finish is long and warming, with a pleasant tartness that lingers alongside caramel and dried fruit. Specialty roasters prize La Unión lots for their ability to perform brilliantly at both light filter roast levels — where the brightness and floral notes shine — and medium-light espresso roasts, where the body and sweetness concentrate into a rich, fruit-forward shot.