What is a coffee micro-lot?

A coffee micro-lot is a batch of green coffee sourced from a single plot, a specific group of producers, or a distinct fermentation process, in limited quantity — typically between 100 and 1,000 kg of green coffee — and rigorously separated from general production throughout the supply chain. Its maximum traceability and rarity result in high SCA scores and prices often two to ten times higher than standard specialty coffee.

The term 'micro-lot' entered specialty coffee vocabulary in the 2000s, as a reaction to origin-blend models and aggregated lots that masked the diversity within any given region. A micro-lot can be defined by several isolation criteria.

Geographic isolation is the most common: a single farm plot, a specific variety planted in an identified block, or a small group of producers from the same community who harvest together and separate their lot from the central washing station. Process isolation is increasingly frequent: an anaerobic fermentation of a specific duration, a lot processed on raised beds versus bare ground, sun-drying under tunnel versus open sky. Varietal isolation constitutes the third type: a 100 % Gesha lot, 100 % Typica Mejorado, or an experimental variety trialled over one season.

For the roaster, the benefit is twofold: high scoring (micro-lots regularly land between 87 and 93 on the SCA scale) and differentiating storytelling — each micro-lot has a name, a face, a story the brand can tell. For the producer, it creates the opportunity for significantly higher remuneration, often triggered by a joint evaluation (export station cupping) and a direct negotiation.

Limitations exist. The absence of a standardised definition means 'micro-lot' is sometimes used as a marketing argument without any genuine traceability or quality guarantee. A 500-kg lot presented as a micro-lot may have been blended with other lots during packing. Serious buyers require photos of the plot, cupping records from a third-party Q-grader, and a chain-of-custody document proving separation throughout the logistics chain. The trend is increasingly towards the 'nano-lot' — volumes below 50 kg, reserved for market leaders and competitions (World Brewers Cup, World Barista Championship) — sometimes fetching prices of 200 to 2,000 USD per kg of green.

Hallmarks of a genuine micro-lot

• Single, documented provenance: plot, producer or group of producers identified by name
• Limited volume: typically 100–1,000 kg of green coffee (below 50 kg for nano-lots)
• Physical separation throughout the chain: harvest, depulping, fermentation, drying, packaging
• High SCA score: most micro-lots score between 86 and 93 points
• Significant price premium: 2× to 10× the price of standard specialty coffee
• Chain-of-custody documentation: cupping sheets, plot photos, Q-grader report