How Colombian Coffee Is Graded by Size, Defects, and Region

When you buy Colombian coffee labeled 'Supremo' or 'Grade AA,' what does that actually mean? Unlike generic 'premium' claims, Colombia uses a detailed, multi-factor grading system based on physical defects, bean size, growing region, and legal export rules. Whether you're a roaster evaluating greens or a home enthusiast curious about origin quality, these grades reveal how the coffee was sorted — and what to expect in the cup.

Colombian coffee is graded primarily by the number of allowable defect beans per 500g, with 'specialty' tiers like Grade AA requiring zero primary defects and fewer than five secondary flaws. Size grades like Supremo and Excelso sort beans by mesh screen size, while regional designations highlight origin-specific harvests. Legal standards further define export-quality lots.

Defect-Based Grading: Counting Flaws Per 500g

Colombia evaluates green coffee based on two types of defects, each with strict limits for different certification bodies:

• Primary (1st-level) defects: These directly harm flavor — e.g., black, sour, or moldy beans. Private exporters allow up to 12 such beans per 500g; the National Coffee Committee permits only 8.
• Secondary (2nd-level) defects: These affect appearance but not necessarily taste — e.g., broken, insect-damaged, underripe, or misshapen beans. Private exporters accept up to 60; the Committee caps them at 35.

Note: One primary defect counts as 10 secondary defects for grading purposes.

Specialty Coffee Grades

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

Size-Based Grading: Mesh Screen Classifications

Colombia also grades coffee by bean size using mesh screens (measured in 'mesh' or 'mesh'). Key size categories include:

• Maragogype: A rare, large-beaned variety with low yields.
• Supremo: Less than 5% of beans below 17 mesh but above 14 mesh.
• Supremo Screen 18+: Less than 5% of beans below 18 mesh but above 14 mesh.
• Excelso Extra: Less than 5% of beans below 16 mesh but above 14 mesh.
• Excelso EP: Less than 2.5% (sometimes adjusted to 5% or 8%) of beans below 15 mesh but above 12 mesh.
• U.G.Q. (Usual Good Quality): Less than 1.5% of beans below 14 mesh but above 12 mesh.

Regional & Seasonal Factors

Historically, Colombian coffee was generically labeled as 'Armenia/Medellin Supreme.' Today, many lots are sold under regional names like Popayán, Bucaramanga, Huila, Tolima, Medellin, and Nariño — each with distinct growing conditions. The country has two main harvests:

• Main crop: Typically higher quality; e.g., Bucaramanga harvests from October to December, Popayán from May to June.
• Mitaca (fly crop): A secondary, often lower-grade harvest.

Legal & Commercial Standards

The National Coffee Committee sets strict rules for exportable coffee. Legal grades include commercial classifications (Maragogype, Supremo, Excelso, UGQ) and specialty tiers (Grade AA, Grade A, Special Grade). Each grade specifies exact requirements for bean size and defect limits. Additionally, coffees with organic, sustainable, or fair trade certifications may also qualify as 'specialty' under both national and private standards.

Frequently Asked Questions

What counts as a primary defect in Colombian coffee grading?

Primary defects are flaws that directly impact flavor, such as black beans, sour beans, or moldy beans. These are the most critical for cup quality, with stricter limits allowed compared to secondary defects.

How many secondary defects are allowed in Grade AA Colombian coffee?

Grade AA coffee allows fewer than 5 secondary defects per 500g, with zero primary defects permitted. Secondary defects include issues like broken or misshapen beans that don’t necessarily affect taste.

What’s the difference between Supremo and Excelso coffee grades?

Supremo beans are larger, with less than 5% of the lot falling below 17 mesh but above 14 mesh. Excelso beans are slightly smaller, with less than 5% below 16 mesh but above 14 mesh (or, in the case of Excelso EP, below 15 mesh but above 12 mesh).

Does Colombia have a main and fly crop season?

Yes, Colombia has two harvests: the main crop (typically higher quality, e.g., Bucaramanga from October–December, Popayán from May–June) and the Mitaca or fly crop (often lower grade).

Are organic or fair trade coffees considered specialty in Colombia?

Yes, coffees with organic, sustainable, or fair trade certifications can qualify as 'specialty' under both national Coffee Committee rules and private exporter standards.

Recommended FrontStreet Beans for Grading Insights

Explore Colombian origins firsthand with FrontStreet Coffee’s Ethiopia Huakui (a washed Ethiopian offering bright citrus and floral notes, great for defect comparison), Kenya Little Tomato (juicy Kenyan with winey acidity to contrast Colombian profiles), and Panama Huacai (a complex Geisha lot highlighting how origin and grading impact cup character). These beans showcase how origin, processing, and sorting — including defect control — shape flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.