What grind size is best for cold brew?

Cold brew works best with a extra coarse grind, roughly 800 to 1500 microns. Brew at 1:8 for 12-18 h.

Why is my cold brew sour?

Grind too fine or steeped too long. Go coarser or cut the steep to 12 hours.

Too little coffee or too short a steep. Use a 1:7 concentrate or steep to 16-18 hours.

800-1500 microns · 1:8 · 12-18 h

Cold brew steeps for hours, so it takes the coarsest grind your grinder makes. Dilute the concentrate about 1:1 to serve.

Cold brew grind setting by grinder
Grinder	Start at	Range	Guide
Fellow Ode Gen 1	10	9-11	Guide →
Fellow Ode Gen 2	10	9-11	Guide →
Fellow Opus	10.5	10-11	Guide →
OXO Brew Conical Burr Grinder	13	11-15	Guide →

Not built for cold brew: Baratza Sette 270, Breville Barista Express (built-in grinder).

It tastes	Why	Do this
Bitter, woody	Grind too fine or steeped too long	Go coarser or cut the steep to 12 hours
Weak, tea-like	Too little coffee or too short a steep	Use a 1:7 concentrate or steep to 16-18 hours
Cloudy, gritty	Fines passing the filter	Go coarser and filter a second time through paper

Fix the beans too

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