Colombian Coffee Grading: Size Matters Most

When shopping for Colombian coffee, you might assume a "Supremo" grade guarantees exceptional taste. But in Colombia, that’s not necessarily true. The country’s coffee classification system is famously straightforward—and surprisingly limited. If you’ve ever bought a bag labeled "Supremo" and expected stunning flavors, only to find something average, you’re not alone. The truth lies in how Colombian beans are actually graded, and it might not be what you think.

Colombian coffee is graded solely by bean size: 18 mesh (about 7mm in diameter) or larger earns the Supremo grade, while anything below is Excelso. That’s it. Taste, processing, or origin? Not part of the official grade.

How Colombian Coffee Gets Graded

Colombia uses a simple, physical method to classify its coffee beans: screen size, measured in "mesh" or " (mù)"—a unit equal to 1/64 of an inch. To be classified as Supremo, beans must be 18 mesh or larger. That translates to roughly 7 millimeters in diameter. Anything under 18 mesh is graded as Excelso. No sensory evaluation, no cupping score, just a sieve test.

What 18 Mesh Actually Means

The mesh system refers to the number of holes per inch in a screening device. One mesh equals 1/64 of an inch, so 18 mesh means the holes are 18/64 inches across. With 1 inch equal to 25.4 millimeters, 18 mesh works out to approximately 7 millimeters in diameter—the minimum size for a Colombian coffee bean to be considered Supremo. Smaller beans fall into the Excelso category.

To put it another way:

• 18 mesh = ~7mm diameter = Supremo grade
• Below 18 mesh = Excelso grade

Why Size Isn’t Everything

A larger bean size doesn’t automatically mean better flavor. In fact, many specialty coffee experts argue that factors like altitude, processing method, and farm practices have a far greater impact on taste. Most high-quality Colombian beans come from specific regions—like Huila—that provide detailed information about origin, farm, and processing. If your bag of Colombian coffee only says "Supremo," it’s likely a commercial-grade bean from the MAM region, not a single-origin specialty lot.

Colombian Coffee Regions and Flavor Potential

Colombia’s coffee-growing geography is diverse, with production spread across the Andes Mountains. The key coffee regions lie in the south, central, and northern parts of the country. The southern regions, especially Huila, are known for producing premium coffees at elevations above 1500 meters. These areas benefit from volcanic soils, consistent shade, and cool temperatures, all of which slow ripening and develop complex flavors. Yet, none of that nuance is reflected in the simple Supremo/Excelso grade.

Frequently Asked Questions

Does Supremo mean better-tasting coffee?

No. Supremo refers only to bean size (18 mesh or ~7mm diameter), not flavor quality. A Supremo bean can taste average or excellent—it’s the origin, altitude, and processing that determine taste, not size.

What is the difference between Supremo and Excelso coffee?

Supremo beans are 18 mesh (approximately 7mm) or larger in diameter, while Excelso beans are smaller than 18 mesh. Both can come from the same regions, and neither grading indicates flavor profile or quality beyond size.

Why doesn’t Colombian coffee grading include taste?

The official Colombian grading system focuses only on physical traits like bean size. It does not evaluate cup quality, aroma, acidity, or other sensory attributes that specialty coffee buyers prioritize.

Are Supremo beans always high quality?

Not necessarily. While larger beans can sometimes correlate with higher elevation or slower maturation, Supremo is purely a size-based grade. Many high-scoring specialty coffees are not labeled Supremo and may be smaller in size but richer in flavor.

Where do the best Colombian coffees actually come from?

The best Colombian coffees often come from regions like Huila, which are noted for high altitudes (1500+ meters), careful farming, and detailed labeling of farm and processing methods. These details matter more for flavor than the Supremo grade.

Recommended FrontStreet Beans for Size & Flavor

FrontStreet Coffee’s Huila Single Origin features the widely grown Caturra variety, washed processed, and roasted to highlight chocolate, hazelnut, and caramel tones with balanced acidity. It’s a great example of how origin detail—not just bean size—delivers flavor. For fruit-forward profiles, try their Sidra or Gesha-style lots, which showcase juicy, floral notes ideal for pour-over or espresso. These beans reflect the quality found in Colombia’s premium regions, beyond basic Supremo grading. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.