How Altitude Affects Coffee Beans
Why high-altitude coffee is generally considered superior, and what 'Strictly High Grown' means.
When reading the label on a bag of specialty coffee, you will often see an elevation listed (e.g., "Grown at 1,800 MASL" - Meters Above Sea Level). You might also see acronyms like SHB (Strictly Hard Bean) or SHG (Strictly High Grown).
Why do roasters put this on the bag? Because the altitude at which a coffee tree is grown is one of the most important factors in the final quality and flavor of the cup.
The Science of High Altitude
As you go higher up a mountain, the climate changes. It gets cooler, the air gets thinner, and there is often better drainage on the steep slopes.
- Cooler Temperatures: At higher altitudes, the temperature drops, especially at night. This cooler environment drastically slows down the growth of the coffee cherry.
- Slower Maturation: Because the cherry takes longer to ripen, it has more time to develop complex sugars, acids, and nutrients.
- Denser Beans: This slow maturation process results in a coffee bean that is physically much denser and harder than a bean grown at lower elevations.
How Altitude Translates to Flavor
The density and sugar development resulting from high altitudes translate directly into the cup:
- Low Altitude (Below 1,000m): These coffees grow quickly in warmer climates. They tend to have very low acidity, a soft body, and earthy or muddy flavors. They are generally considered lower quality and are often used for instant coffee or commercial blends.
- Medium Altitude (1,000m - 1,300m): These coffees are sweet and smooth. They often have notes of chocolate, nuts, and mild fruit. Many great Brazilian coffees are grown in this range.
- High Altitude (1,300m - 1,800m+): This is where specialty coffee thrives. The extreme density of these beans requires more heat to roast, but they reward the roaster with incredible complexity. These coffees feature bright, vibrant acidity, distinct floral and fruity notes, and exceptional sweetness. Most coffees from Ethiopia, Kenya, and Colombia fall into this category.
SHB and SHG
Many Central American countries use an altitude grading system to classify their coffee:
- SHG (Strictly High Grown) or SHB (Strictly Hard Bean): These terms are synonymous. They indicate that the coffee was grown at an altitude higher than 1,200 meters. This grading guarantees a certain level of density and quality.
So, the next time you buy coffee, look at the elevation. If it's grown high up in the mountains, you're likely in for a vibrant, complex, and high-quality cup.