Grind your organic coffee coarse for cold brew, about the texture of raw sugar or coarse sea salt. According to Fellow’s grind size guide, that is roughly 1,000 to 1,400 microns, the coarsest end of the grinding spectrum.
The organic label does not change this answer. Organic certification covers how the beans were farmed, not how they should be ground.
Coarse is the safe default, and a medium-coarse grind also works as a starting point when you want a fuller extraction. Aim for coarse to extra-coarse, brew a test batch, then adjust by taste.
Why Cold Brew Needs A Coarse Grind
The grind sets the pace of a cold brew because the grounds steep for 12 to 24 hours. A grind that is too fine over-extracts during a soak that long and turns the smooth, mellow drink bitter.
The National Coffee Association recommends a coarse grind for cold brew. Starbucks makes its own cold brew recipe the same way, starting with coarsely ground coffee.
Cold water pulls flavor from coffee far more slowly than hot water. Tiny particles give up too much over such a long soak, including harsh flavors, and they slip past filters as sludge.
Coarse particles dissolve gently across the entire steep. That slow, steady extraction is what keeps cold brew smooth instead of sharp.
Slow-drip cold brewers, which pass water through the grounds once instead of soaking them, can use a slightly finer grind. Standard immersion batches, where the grounds sit fully underwater, follow the coarse rule.
An even grind at the right size starts with the tool doing the grinding.
Use A Burr Grinder, Not A Blade Grinder
A burr grinder is the right tool for cold brew because it cuts every bean into pieces of nearly the same size. A blade grinder smashes beans at random, leaving chunks mixed with dust.
Those dust-like particles, called fines, brew quickly, slip through filters, and leave a cloudy, bitter cup. The Spruce Eats notes that cold brew is forgiving but still sensitive to how consistent the grind is.
The Baratza Encore burr grinder is one example of an electric burr grinder with the range for a true coarse setting. Click-style manual hand grinders also work, set near the coarse end of their range.
Key Specifications:
- Burr type: conical steel burr
- Settings: 40 stepped grind settings
- Range: fine settings for espresso through extra-coarse settings for cold brew
- Best for: cold brew, drip, and other filter batches
One bit of confusion about the organic label is worth clearing up before you brew.
Does The Organic Label Change The Grind?
No, the organic label does not change the grind for cold brew. Coarse is correct whether your bag is organic or not.
Organic certification describes how the coffee was grown, without synthetic pesticides or fertilizers. It says nothing about bean density, roast color, or how beans shatter in a grinder.
The variables that actually move the grind setting are roast level and steep length, not the farming practices on the label.
Dark roasted beans are more brittle, so they shatter into fines more easily, organic or not. A slightly coarser setting keeps dark roast batches from turning bitter.
Light and medium roasts are denser and grind into cleaner, even particles. A true coarse setting suits them, and a steep toward the longer end of the range pulls out full flavor.
Brew strength is the next question, and it lives in the ratio, not the grinder.
Match A Coarse Grind To Your Ratio And Steep Time
Strength in cold brew comes from the coffee-to-water ratio and the steep time, not from a finer grind. Grinding finer mostly adds bitterness and sediment, not strength.
One caution: cold brew can mean a concentrate you dilute later or a ready-to-drink batch poured straight. The grind stays coarse either way, and only the amounts change.
Most recipes call for between 1:4 and 1:8 coffee to water by weight. Concentrates run strong at 1:4 to 1:5, and ready-to-drink brews run mild at 1:8 to 1:10.
Use the table below to choose a ratio and steep time for your next coarse-ground batch.
| Starting point | Coffee to water by weight | Steep time | Grind |
| Ready-to-drink | 1:8 to 1:10 | 12 to 24 hours | Coarse |
| Concentrate | 1:4 to 1:5 | 16 to 20 hours at room temperature, or 20 to 24 hours refrigerated | Coarse |
| Flexible range | 1:4 to 1:8 | 12 to 24 hours | Coarse |
| Example batch | 100 g coffee to 500 g water | 16 to 20 hours | Coarse |
Weigh your coffee instead of scooping it, since bean density and roast level change how much fits in a tablespoon. A digital coffee scale makes gram-level recipes easy.
Pour cold or room-temperature filtered water over the grounds. Stir gently until every ground is saturated and no dry clumps float on top.
Grind right before you add the water, because ground coffee loses its aroma faster than whole beans. Freshness matters before you brew too, and the freshness window for organic cold brew beans shapes flavor before you ever grind.
Fix Batch Problems By Adjusting The Grind
Diagnosing cold brew is simple: taste the batch, name the problem, and change one setting at a time. The grind is the first place to look.
Weak, thin, or flat cold brew can indicate under-extraction from a grind that is too coarse. Go slightly finer for the next batch.
Bitter, harsh, or sludgy cold brew can indicate over-extraction from a grind that is too fine. Go slightly coarser next time.
According to Fellow’s grind size guide, grinding too fine also causes a muddy texture and stalled filtering. A batch that barely drips through its filter needs a coarser setting, too.
Sediment in the cup usually points to fines that slipped through the strainer. Strain finished cold brew through a fine mesh first, then through a paper filter or cloth for a clean pour.
Reusable cold brew filter bags make that first straining pass easy.
Cold brew ground as fine as espresso comes out bitter, gritty, and slow to filter. The fine grind organic espresso requires belongs in an espresso machine, not a steeping jar.
One taste and one adjustment per batch gets you closer to the right coarse setting.
Grind your organic coffee coarse for cold brew, with the look and feel of raw sugar or coarse sea salt. The organic label describes the farm, not the grinder setting.
Steep 100 grams of coarse grounds in 500 grams of water for 16 to 20 hours. Taste it, then go a touch finer for weak brews or a touch coarser for bitter ones.