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What Is Second Crack in Coffee Roasting?

Writer: Kühne Kaffee
Kühne Kaffee
Aug 10
1 min read

Definition

A later, generally finer and more rapid crack associated with further structural breakdown at darker roast levels.

Why it matters

Its approach signals a narrow operating window in which smoke, surface oils and darker flavors can increase quickly.

How it is measured or recognized

Identify it by sound and support the call with color, temperature trend and exhaust observations.

Roasting tip

Use strong ventilation and close attention; the coffee can change rapidly around second crack.

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