tags: [] - coffee/roasting - coffee/roasting/profile aliases: - End temperature - Roast drop temperature - Bean drop temp

Drop Temperature¶

Overview¶

Drop temperature is the bean probe temperature at the moment the roaster opens the drum and discharges the batch into the cooling tray. It is the final temperature reading in the roast profile and, together with Development Time Ratio, is one of the two primary parameters defining the degree of roast development. The drop temperature determines how far through the development phase the roast has progressed: a lower drop temperature produces a lighter roast with less caramelisation and more origin character preserved; a higher drop temperature produces a darker roast with more caramelisation, greater bitterness, and progressively less origin expression. Because drop temperature interacts with the Rate of Rise at the time of drop, it must be calibrated in conjunction with the roast profile's energy management rather than used as an isolated target.

Drop Temperature and Roast Level¶

Drop temperature provides a useful reference for roast level, but it is roaster-specific: the same drop temperature on different roasting machines — or even on the same machine at different batch sizes or charge temperatures — can produce different degrees of development. This is because drop temperature reflects where the bean temperature is at the moment of drop, but the degree of development also depends on how much time was spent at that temperature and the shape of the curve that led there.

Approximate ranges for drum roasters as a general reference (highly equipment-specific):

Roast Level	Approximate Drop Temperature
Light roast	195–208 °C
Medium-light roast	205–215 °C
Medium roast	210–220 °C
Medium-dark roast	218–225 °C
Dark roast	222–232 °C
Very dark (French)	228–238 °C

These ranges are indicative. A roaster must calibrate drop temperatures by cupping — roasting to a given drop temperature, then cupping the result, and adjusting until the cup outcome matches the target roast level.

Drop Temperature and Development Time Ratio¶

Drop temperature and DTR are complementary metrics. Two roasts with the same drop temperature but different DTRs will produce different cups: the roast with more development time at that temperature will have a more fully caramelised, sweeter, and less acidic profile. Conversely, the same DTR achieved at different drop temperatures reflects different absolute levels of heat exposure.

The interplay between drop temperature and DTR defines the development outcome more completely than either metric alone:

Low drop temperature + low DTR: Underdeveloped; harsh, sour, raw
Appropriate drop temperature + appropriate DTR: Intended roast level; balanced development
High drop temperature + long DTR: Overdeveloped; dark, bitter, roasty

Drop Temperature Consistency¶

For batch-to-batch replication, the drop temperature must be consistent within approximately ±1–2 °C between batches of the same green coffee at the same target roast level. Even small changes in drop temperature — caused by operator timing variability, ambient temperature changes, or Rate of Rise variation — produce noticeable differences in cup outcome. Roast logging software allows the roaster to review the drop temperature for every batch against historical data, identifying drift before it becomes a quality problem.

Key Facts¶

Drop temperature: bean probe temperature at the moment of discharge from the drum to the cooling tray
Defines how far the development phase has progressed; determines roast level in combination with DTR
Roaster-specific: the same drop temperature on different equipment produces different degrees of development
Must be calibrated by cupping for each roaster, batch size, and green coffee type
Consistency requirement: ±1–2 °C batch-to-batch for reliable profile replication
Works in conjunction with DTR — drop temperature alone does not fully define roast outcome

References¶

Changelog¶

Date	Change
2026-04-27	Note created
2026-05-02	Compliance review: added --- before copyright

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