Colombian Coffee Bean Grading by Size and Defects

When sourcing Colombian coffee, you may come across grades like Supremo, Excelso, or even obscure terms such as Maragogype—but what do they really mean? These classifications aren’t random labels. They reflect physical traits and quality thresholds that determine how a coffee is sorted, traded, and roasted. Whether you're buying green beans or evaluating a potential single origin, understanding this system helps you make informed decisions.

In short, Colombian coffee beans are graded primarily by bean size (measured in mesh or ‘mesh count’), allowable defect counts per 500g, and regional or harvest distinctions. For example, Supremo beans must have over 95% of the sample at or above 17 mesh, while Excelso allows up to 2.5% below 15 mesh. Specialty-grade beans further limit defects to fewer than 5 total secondary flaws per 500g.

Coffee Bean Size Grades in Colombia

Colombia uses a mesh system to classify beans by size, which strongly influences roast profile and market tier. Here’s how the sizing grades break down:

• Maragogype: An extra-large bean variety (often called Elephant Bean), relatively rare and produced in smaller quantities.
• Supremo: At least 95% of beans must measure above 14 mesh, with no more than 5% below 17 mesh. Often considered a premium commercial grade.
• Supremo Screen 18+: Even stricter—95% of beans must be above 14 mesh, and none below 18 mesh.
• Excelso Extra: Up to 2.5% of the sample can be below 16 mesh but above 14 mesh. This grade often includes slightly smaller beans than Supremo.
• Excelso EP (European Preparation): Allows up to 2.5% (sometimes adjusted to 5% or 8%) of beans below 15 mesh but above 12 mesh. Slightly more lenient on size variance.
• U.G.Q. (Usual Good Quality): Up to 1.5% of the sample can measure below 14 mesh but above 12 mesh.

Defects: How Quality Is Measured by Flaws

Colombian coffee is also graded by the number and severity of defects in a 500g sample. Defects fall into two categories: primary (flavor-affecting) and secondary (visual).

• Primary defects include black, sour, or moldy beans—issues that directly impact taste.
• Secondary defects cover broken, insect-damaged, discolored, unripe, or misshapen beans—issues that affect appearance but may or may not influence cup quality.

Here’s how different standards define allowable defects:

• Private exporters: Allow up to 72 total defects, with no more than 12 primary (one primary = 10 secondary) and 60 secondary.
• Colombia National Coffee Committee: Stricter, allowing just 42 total defects, including a maximum of 8 primary and 35 secondary.

For coffee to qualify as Specialty Grade, the thresholds are even tighter:

• Grade AA: Zero primary defects, fewer than 5 secondary defects per 500g.
• Grade A: Fewer than 3 primary and 8 secondary defects per 500g.
• Grade B: Fewer than 8 primary and 35 secondary defects per 500g.

Coffee Regions and Harvest Seasons in Colombia

Though size and defects are universal grading tools, Colombia also classifies coffee by origin and harvest timing—factors that significantly shape cup characteristics.

Traditionally, Colombian beans were generically labeled as “Armenia/Medellín Supreme.” But today, beans are increasingly sold by region. Key producing areas now include:

• Popayán
• Bucaramanga
• Huila
• Tolima
• Medellín
• Nariño

These regions are part of Colombia’s three main zones: northern, central, and southern. Most high-scoring coffees come from the southern zone, especially Huila, which has earned acclaim for consistent competition-level lots.

Colombia has two main harvests:

• Main Crop (Cosecha Principal): Typically higher quality, with regional variations such as October–December in Bucaramanga and May–June in Popayán.
• Mitaca (Fly Crop): A secondary, usually smaller harvest with generally lower cup profile intensity.

The same grading criteria—size, defects, and more—apply across many coffee-growing nations, though local standards may vary. What remains constant is that beans meeting the highest screens and lowest defect counts often produce the most vibrant, complex cups.

Frequently Asked Questions

What is the difference between Supremo and Excelso coffee beans?

Supremo beans are larger, with at least 95% of the sample graded above 14 mesh and no more than 5% below 17 mesh, often considered a premium grade. Excelso beans allow up to 2.5% of the sample to be smaller (below 16 mesh but above 14 mesh) and are typically slightly more varied in size. Both can be high quality, but Supremo often commands a higher market position due to size consistency.

What are primary and secondary defects in coffee grading?

Primary defects are serious flaws like black, sour, or moldy beans that directly harm flavor. Secondary defects include visual issues such as chipped, broken, insect-damaged, or unripe beans. These may affect appearance and sometimes cup quality but are not always taste-related. Specialty coffee allows far fewer of both.

How is coffee bean size measured in Colombia?

Colombian coffee beans are sized using a mesh system. Each grade specifies how much of the bean sample must pass through or be retained by certain mesh sizes (e.g., 17, 18, or 14 mesh). The higher the mesh number, the smaller the openings—and the larger the beans that are excluded. For example, 18+ means no beans below 18 mesh are allowed beyond a minimal percentage.

Does Colombia have different coffee harvest seasons?

Yes, Colombia has two main harvests: the Main Crop (usually higher quality) and the Mitaca or Fly Crop (typically smaller and lower in cup intensity). Timing varies by region—for example, the main harvest in Bucaramanga runs from October to December, while in Popayán it occurs from May to June.

What makes Huila a notable coffee region in Colombia?

Huila is part of Colombia’s southern coffee zone and is renowned for producing high-scoring, competition-quality lots. It lies at higher elevations and benefits from optimal growing conditions, making it a consistent source of specialty-grade Colombian coffee.

Recommended FrontStreet Beans for Size & Specialty Grading

Explore FrontStreet Coffee’s Colombian offerings to experience the impact of bean size and careful grading. Their FrontStreet Colombian Huila is a single-origin lot grown above 1500 meters, featuring notes of chocolate, caramel, and citrus—typical of high-altitude, low-defect beans. For something fruit-forward, try the FrontStreet Sidra or FrontStreet Gesha-inspired lots, which showcase the complexity possible in well-graded, high-mesh Colombian coffees. All are carefully selected and roasted to highlight origin character. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.