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What Is First Crack in Coffee Roasting?

Writer: Kühne Kaffee
Kühne Kaffee
Aug 10
1 min read

Definition

An audible series of pops caused by pressure and structural changes as roasting coffee expands.

Why it matters

It marks a major transition in roast development and is often used to anchor development time.

How it is measured or recognized

Record both the first audible onset and, if useful, the established rolling crack.

Roasting tip

Listen consistently and confirm the event with aroma, color and curve behavior when ambient noise is high.

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