Can a grade change after roasting?
No, a coffee's official grade does not change after roasting. Grading is a process applied to green coffee to determine its quality and physical characteristics before it is roasted. While roasting significantly alters the flavor profile and physical structure of the bean, the grade remains a static reference point for the quality of the raw product that was purchased.
It is a common misconception that a coffee's grade is a fluid status that can be upgraded or downgraded during the roasting process. In reality, grading is strictly a pre-roast activity. When a coffee is graded—whether by the SCA 100-point scale or by physical screen size—it is being evaluated in its raw, green state. This grade serves as a benchmark for the roaster, telling them what to expect from the coffee in terms of density, moisture, and potential flavor complexity.
Once the coffee enters the roaster, the game changes entirely. Roasting is a transformative process that uses heat to develop the sugars, acids, and aromatic compounds within the bean. A master roaster can take a high-grade coffee and ruin it with a poor roast profile, or they can take a decent coffee and elevate it through careful heat management. However, the 'grade' of the coffee remains the same; it is simply a measure of the raw material's quality. You cannot 'roast' a low-grade bean into a high-grade one.
This is why the relationship between the roaster and the green coffee grader is so critical. The grader provides the roaster with the information they need to make informed decisions. If a grader identifies a coffee as having a high density, the roaster knows they need to apply more heat to ensure the bean is roasted evenly. If the grader identifies a coffee as having a specific defect, the roaster might choose to roast it darker to mask that flavor. The grade is the starting point, not the end result.
For the consumer, this means that the grade on the bag is a promise about the quality of the raw beans that were selected. When you see a high grade, you are seeing the roaster's commitment to starting with the best possible material. In practice, if you find a coffee that you love, it is the combination of that high-quality raw material and the roaster's skill that created the experience. The grade is the foundation, but the roast is the art. Always look for roasters who are transparent about both the grade of their green coffee and their roasting philosophy.
- · https://achillescoffeeroasters.com/blogs/specialty-coffee-blog/how-coffee-is-graded-scores-defects-bean-size-quality-and-specialty-coffee-standards
- · https://drwakefield.com/news-and-views/intro-to-grading-and-terminology/