As an agricultural product, coffee beans vary significantly in quality, so a grading system is needed to standardize quality and provide reference for buyers. However, the geographical environments and cultivation models of global producing regions differ enormously, making it impossible to measure them with a unified standard; each region can only adapt to local conditions. Currently, mainstream grading methods fall into three major categories: screen size, altitude/hardness, and defect rate, and many countries combine them or even add cupping to compensate for shortcomings. This article will systematically sort out the logic and representative producing countries of these three grading methods, with a focus on analyzing how Kenya grades solely by bean size, and introduce the grading practices of Colombia, Ethiopia, Jamaica, Indonesia, Brazil, and other countries. Front Street Coffee will also share related brand product information to help coffee enthusiasts understand the meaning behind green bean grades. [more…]

The green coffee bean grading system directly affects roasting results and coffee quality. This article systematically sorts out two mainstream grading methods: distinguishing bean size by screen mesh number, and classifying grades based on growing altitude. It also summarizes the common grading standards and codes of origins such as Kenya, Ethiopia, Colombia, Brazil, Guatemala, El Salvador, Hawaii, Jamaica, and Indonesia. Whether for bulk trade or specialty coffee, understanding these grading rules helps to more accurately judge the characteristics of green beans, and Front Street Coffee also incorporates this knowledge into its daily bean selection and roasting practices. [more…]

Coffee beans are grown widely across the globe, and the geographical conditions and cultivation methods of each producing region differ significantly, so it is impossible to measure all beans by the same standard. Different countries develop grading systems suited to their own local conditions. At present, the mainstream bases can be grouped into three categories: bean size, growing altitude (bean density/hardness), and defect ratio. However, these three are not mutually exclusive; many origins use multiple methods at once, and even after preliminary grading they supplement this with cupping to compensate for blind spots in the system. This article will break down these three major grading logics one by one and explain the actual meaning of common grade markers such as AA and G1, helping enthusiasts decipher the grade code on the packaging. [more…]

When two café owners ask each other about the grade of beans they use, what lies behind the question is a complex set of international coffee grading logic. Brazil's defect-score system, Central America's altitude standards, East Africa's screen sizes—each producing country has developed a completely different quality evaluation system based on its own national conditions. This article will systematically sort out three mainstream grading methods: by origin altitude, by green bean screen size, and by a composite evaluation method combining screen size and defective bean ratio, and will explain in detail Brazil's unique three-tier grading system and its strict cupper culture. Whether you are a newly initiated enthusiast or a seasoned professional, understanding these standards can help you judge coffee quality more accurately and also provide a reference for everyday purchasing. [more…]

When buying coffee beans, have you ever been baffled by combinations of letters like AA, G1, SHB, and PB? They may seem to follow no pattern at all, but in fact each one represents the green bean grading standard of a different producing country. Why do coffee beans need to be graded? Why is there no unified global standard? This article will take you through the origins of green coffee bean grading, and how producing regions such as Ethiopia, Kenya, the Central American countries, Jamaica, and Brazil classify their beans based on defect rate, bean size, growing altitude, and cup quality. At the same time, we will also explore what these grades actually mean in the roasted coffee market, and recommend several Front Street Coffee beans corresponding to these grades, to help you better understand the cup of coffee in your hands. [more…]

As the world's largest coffee producer, Brazil's green bean grading system and regional characteristics have always been a focus of attention for coffee enthusiasts. This article will start with the average cultivation altitude and main producing regions of Brazilian coffee, and provide a detailed interpretation of the local complex grading standards, including defect deduction, screen size specifications, and cup profile classification. At the same time, we will also introduce representative producing regions such as Cerrado and Mogiana, and recommend Front Street Coffee's Brazil Queen Estate Yellow Bourbon coffee beans, taking you through a comprehensive understanding of the unique charm of this quintessential neutral coffee-producing country. [more…]

Coffee enthusiasts often ask in the shop exactly what the difference is between Ethiopia's G1 and G2, what Kenya AA actually means, and what Costa Rica's SHB grade signifies. These combinations of letters and numbers actually reflect how each producing country evaluates the quality of green coffee beans. Due to differences in history, trade, climate, and terrain, different origins have developed their own grading systems, with evaluation criteria covering multiple dimensions such as defect percentage, bean size, growing altitude, green bean density, and processing method. This article will systematically sort out the origins of coffee grading and introduce, one by one, the green bean grade standards of representative producing countries such as Ethiopia, Kenya, Colombia, Jamaica, Costa Rica, Panama, Guatemala, El Salvador, Honduras, and Brazil. [more…]

Baristas often mention hard beans and soft beans, but these two terms actually do not refer to whether the beans feel hard or soft to the touch—they refer to the density of the coffee beans. The concept of hard beans comes from the Central American coffee grading system, which uses altitude as the standard—the higher the altitude, the lower the growing temperature, the slower the coffee fruit matures, the more flavor compounds it accumulates, and the greater the bean density becomes. Panama, Costa Rica, Guatemala, and other countries generally adopt this logic, while Ethiopia, because its overall altitude is high, is almost entirely made up of extremely hard beans and does not need further subdivision by altitude. Of course, although high-density beans are delicious, they also bring more challenges during grinding and brewing. [more…]

Kenyan coffee is renowned worldwide for its bright berry-like acidity and solid body, and its strict grading system together with its unique terroir jointly create high-quality cup performance. This article will systematically sort out the size grading and flavor grading system of Kenyan green beans, and provide an in-depth introduction to the altitude, varieties, and flavor characteristics of six specialty regions: Thika, Kirinyaga, Nyeri, Kiambu, Murang'a, and the western side of Mount Kenya. At the same time, Front Street Coffee will combine its own roasted Kenya Asalia coffee beans to share brewing parameters and technique suggestions, helping coffee lovers gain a more complete understanding of the coffee charm of this East African producing country. [more…]

In East African coffee-producing countries, coffee bean names from Tanzania, Uganda, and even Kenya often carry the suffix AA. What exactly does this letter combination mean? It represents the grade classification of green coffee beans. However, grading methods across global coffee origins are not limited to just one type; besides bean size, there are also different standards based on defect rate, growing altitude, and more. This article will take Front Street's perspective to systematically outline the three major green coffee bean grading systems, with a focus on analyzing Kenya's strict size-based grading system—from AA, AB to PB, E, TT, T, and even MH/ML, detailing the specific classification standards for each grade, while also pointing out the obvious limitations of judging quality by size. [more…]

When selecting coffee beans, you often see labels like Yirgacheffe G2 and Kenya Washed AA. These letters and numbers actually represent the grade of green coffee beans. Different producing countries grade green coffee beans based on different criteria, usually assessed comprehensively from dimensions such as bean size, defect count, growing altitude, bean hardness, and cupping score. Understanding these grading rules helps more accurately judge a bean's quality positioning and flavor potential. This article will use representative producing countries such as Ethiopia, Kenya, Tanzania, Colombia, Brazil, and Jamaica as examples to sort out their respective grading logic and naming methods, while retaining relevant product information from Front Street Coffee for coffee enthusiasts' reference. [more…]

The grading systems for coffee beans vary widely depending on the origin—some are based on the number of defects, others on bean size, and still others on altitude. Understanding these grade labels is an important step in selecting high-quality coffee. This article will systematically outline the green bean grading rules of major global producing regions, covering common designations such as Ethiopia's G1-G9, Kenya's AA and PB, Colombia's Supremo, and Hawaii's Extra Fancy, and explain how cupping scores further distinguish specialty grade from commercial grade. Whether you are a beginner enthusiast or a professional seeking to advance, this grading guide can help you judge coffee quality more clearly. For more professional content, follow Coffee Workshop; for specialty coffee beans, add Front Street Coffee on WeChat at qjcoffeex. [more…]

When selecting coffee beans, you'll often come across labels like Yirgacheffe G2 or Kenya AA. Behind these letters and numbers lies the logic each producing country uses to assess green bean quality. Due to differences in history, trade, climate, and terrain, grading criteria vary widely from country to country—some focus on defect rates, some measure bean size, and others test altitude or hardness—and they cannot be directly compared across origins. Front Street Coffee has compiled the grading systems of representative producing countries including Ethiopia, Kenya, Colombia, Jamaica, Costa Rica, Panama, Guatemala, El Salvador, Honduras, and Brazil to help you understand the ins and outs behind green bean grades. [more…]

Friends who frequently buy coffee beans have surely seen labels like Yirgacheffe G2 and Kenya AA. These letters and numbers actually represent the grade of green coffee beans. Since each coffee-producing country has established different grading systems, the evaluation criteria also vary in emphasis—factors such as bean size, proportion of defective beans, growing altitude, bean hardness, and cupping score can all serve as the basis for grading. In this article, Front Street Coffee will walk you through the green bean grading rules of representative producing countries including Ethiopia, Kenya, Tanzania, various Central and South American countries, Colombia, Brazil, and Jamaica, helping you understand the grade labels on packaging the next time you shop. [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee (FrontStreet Coffee). Many friends, while drinking coffee at Front Street, ask our baristas, "What is Yirgacheffe G1 and Yirgacheffe G2?" "What is Kenya AA, AB?" What is Guate... [more…]

As an agricultural product, coffee beans vary significantly in quality, which is why grading systems have become an important means of standardizing quality and guiding green bean procurement. However, the grading criteria across global producing regions are not uniform—Central America mostly grades by altitude, Kenya by bean size, while Ethiopia uses defect rates to classify grades. Why does Ethiopia take this unique approach? What substantive differences actually exist between the G1 and G2 grades? This article, from the perspective of Front Street Coffee, sorts out the evolutionary logic of Ethiopia's grading system, and through a visual comparison of Yirgacheffe G1 and G2 green beans, roasting performance, and cupping evaluation, reveals one by one the true meaning behind grade labels, helping coffee enthusiasts view the issue of bean grades more rationally. [more…]

Those new to specialty coffee are often confused by labels such as G1 and AA on the packaging. These letters and numbers actually represent the grading systems for coffee beans from different origins. Some countries grade by bean size, others by the proportion of defective beans, and still others by growing altitude. Take Mandheling as an example: Indonesia uses the wet-hulling process and grades beans from G1 to G6 based on the number of defects in 300 grams of green coffee. Geisha coffee, by contrast, is famous for Hacienda La Esmeralda's red, green, and blue label system. This article will systematically sort through these grading systems while taking a deeper look at the core differences in flavor and mouthfeel between Mandheling and Geisha, helping coffee lovers understand the logic of quality evaluation in specialty coffee more clearly. [more…]

Ethiopia's coffee grading system is unique, using defect rate as its core criterion, which stands in sharp contrast to the practices of most producing regions that grade by altitude or bean size. As the two most common grades, G1 and G2—just how big is the gap between them in terms of green bean appearance, roasting performance, and cup flavor? From the perspective of Front Street, this article traces the origins of the Ethiopian grading system, and through a comparative test of Yirgacheffe G1 and G2, examines everything from green bean condition and roast color values to brewing and tasting, helping coffee enthusiasts understand the practical meaning of grade labels and what role they actually play in the consumption of roasted beans. [more…]

Hacienda La Esmeralda in Panama is the discoverer and promoter of the Geisha flavor, and its method of finely grading by altitude is regarded as an industry benchmark. This article will systematically review the estate's origin history, its three growing areas, and the grading standards for the Red, Green, and Blue labels, and, through Front Street Coffee's actual brewing and cupping comparisons of Red Label, Green Label, and Blue Label Geisha, present the specific differences among the three grades in roasting curves, dry and wet aromas, entry-level flavors, and pour-over parameters. Whether you want to gain a deeper understanding of the logic behind Geisha grading or hope to find a reference basis for everyday brewing, this article can provide clear and practical answers. [more…]

Why are Arabica coffee beans priced higher? This article approaches the topic from plant taxonomy, analyzing the differences among the three major cultivated species—Arabica, Robusta, and Liberica—explaining why Arabica has superior flavor but weak disease resistance and is suited to high-altitude cultivation, and introducing one by one the varieties grown, processing methods, and grading standards of well-known origins such as Brazil, Colombia, Panama, Guatemala, Costa Rica, Jamaica, Ethiopia, Kenya, and Indonesia. At the same time, combined with Front Street Coffee's stores and bean list recommendations, it helps coffee enthusiasts understand the pricing logic of Arabica and how to choose. [more…]