How to Identify Coffee Roast Levels by Color and Timing

Ever stared at a bag of beans and wondered whether it’s light, medium, or dark roast? With so many roast names—city, French, espresso—it’s easy to get lost. But pros don’t guess. They measure. Here’s how coffee roast levels are actually determined, from the official standards to the sounds and colors that define each stage.

The Specialty Coffee Association of America (SCAA) uses an infrared caramelization analyzer (Agtron) to assign eight standardized roast levels based on bean color. These range from very light (Agtron ~95) to very dark (Agtron ~25), with visual reference blocks for consistency. Most commercial roasters also rely on the timing of first and second crack to guide their roast profiles.

What Is a Coffee Roast Level?

Roasting transforms green coffee beans into the aromatic, flavorful beans we brew. Through heat, beans lose 15–25% of their moisture, expand in size, darken in color, and develop the acids, sugars, and aromas that define their profile. This process, typically lasting 12–16 minutes at temperatures up to 450°F (232°C), triggers chemical changes akin to the Maillard reaction and includes audible milestones like first and second crack.

The SCAA’s Eight Standard Roast Levels

The SCAA established eight roast levels, assigned numerical values via Agtron color measurement. These are visualized as eight standardized color blocks, ranked from lightest to darkest. Though originally designed for consistency, these shades serve as a universal reference across the industry. The actual roast level is determined both by color and the roast timing milestones described below.

While these eight colors provide a baseline, regional preferences—like “French” or “Italian” roast—often lead to different interpretations. As a result, the same roast might be called different names in different countries, even if its Agtron value falls within a similar range.

How Roasters Judge Roast Level by Sound and Time

In practice, especially outside standardized lab settings, roasters often identify roast levels based on the timing of physical changes during roasting—primarily the “first crack” and “second crack.” These audible events signal chemical and structural shifts in the bean. Here’s how timing is commonly used to define roast levels:

• Light Roast (Light/Cinnamon): Dropped at or just after the start of first crack. Bright acidity, light body.
• Medium Roast (City/Breakfast): Roasted between the end of first crack and just before second crack begins. Balanced flavor, often used for filtered coffee.
• Full City (Medium-Dark): Dropped right at the start of second crack. Fuller body, more rounded flavors.
• Italian/French Roast: Roasted well into or after second crack. Heavy body, low acidity, prominent roast flavors.

These stages reflect not just color but also the internal development of the bean, including sugar caramelization and the breakdown of acids and chlorogenic acids. The first crack usually occurs around 5–7 minutes into the roast, when beans turn from green to yellow and begin expanding. The second crack follows later, around 12–16 minutes, as the roast deepens and the beans darken significantly.

What Happens During the Roast Process?

Roasting is where green coffee transforms. Here’s a breakdown of key phases:

• Green Beans: Contain high levels of chlorogenic acids and little to no developed flavor. Moisture content is high.
• Early Roast (First Crack Begins): Around 5–7 minutes in, beans lose moisture, turn yellow to light brown, and emit a grassy or vegetable-like aroma. First crack signals the expansion of the bean structure.
• Light Roast: Achieved just after first crack. Colors range from cinnamon to light brown. Acidity is pronounced, and sweetness is still developing. Commonly used in mass-market or pre-ground coffee.
• Medium Roast: Reached between the end of first crack and before second crack. Beans turn a balanced brown. Flavor highlights origin characteristics while starting to integrate roast notes. Popular for breakfast blends.
• Full City: Dropped at the onset of second crack. Body increases, acidity softens, and sweetness becomes more prominent. Oils may begin to emerge on the surface.
• Dark Roast (Italian/French): Roasted well into or after second crack. Beans are dark brown to nearly black, with shiny surfaces from oils. Acidity is muted, and roast flavors dominate. Ideal for espresso.

Chlorogenic acids degrade over the roast, reducing perceived bitterness and allowing other acids—like citric, malic, and phosphoric—to shape the cup. Properly roasted beans will balance these elements, while over-roasting can obscure origin traits beneath charred, bitter notes.

Regional Roast Names vs. Objective Standards

Terms like “French roast” or “Italian roast” originated from regional preferences rather than strict technical definitions. For example:

• “French roast” typically refers to a very dark roast, often after second crack, yielding a bold, smoky cup with low acidity.
• “Italian roast” is similarly dark, optimized for espresso extraction with a heavy body and intense roast character.
• “City” and “Full City” are American terms describing medium and medium-dark roasts, often used for single-origin pour-overs or drip coffee.

These names vary by country and roaster, which is why the SCAA’s Agtron-based standard exists—to provide an objective reference. Even so, individual roasters may interpret the same roast level differently based on equipment, bean origin, or desired flavor profile.

Frequently Asked Questions

What is the SCAA roast standard?

The SCAA uses Agtron color readings to define eight roast levels, ranging from very light (high Agtron value) to very dark (low Agtron value). These are visualized as eight standard color blocks for consistency in the coffee industry.

What are first and second crack in coffee roasting?

First crack is the initial popping sound beans make around 5–7 minutes into roasting, caused by moisture expansion. Second crack, occurring around 12–16 minutes, is a finer, more rapid sound signaling deeper roast development and oil release.

How do roast levels affect coffee flavor?

Light roasts preserve bright acidity and origin flavors. Medium roasts balance acidity and body. Dark roasts emphasize bold, smoky, or sweet roast notes with lower acidity. Each level alters the flavor profile through chemical changes in acids, sugars, and aromatics.

Why do different countries call the same roast different names?

Names like “French roast” or “Italian roast” come from local taste preferences. A roast considered “French” in one country might match another country’s “dark city” or “espresso” profile, despite similar color and roast timing.

What roast level has the least caffeine?

Contrary to popular belief, darker roasts actually have slightly less caffeine due to minor loss during extended roasting, but the difference is minimal. Roast level has negligible impact on caffeine content compared to bean variety or brew method.

Recommended FrontStreet Beans for Roast Exploration

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright, juicy light roast with citrus and floral notes; their Colombia Huila offers a balanced medium roast with chocolate and nutty tones ideal for city-level brewing; and for dark roast fans, the FrontStreet French Roast delivers bold, smoky intensity with a hint of caramel. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.