Grind your Colombian coffee coarse for cold brew, roughly like raw sugar or coarse sea salt. That single choice does more for a smooth cup than almost anything else you control.
A coarse grind, around 1,000 to 1,300 microns according to Barista Hustle’s cold brew extraction research, keeps the bitter, astringent particles from taking over during the long steep. Most Colombian beans are washed Arabicas grown at high altitude, which makes them dense and bright, so grind size matters even more here than for your average bag.
If your brew tastes sharp or sour, that can indicate under-extraction and you need to go finer. If it tastes dry, chalky, or bitter, that often points to over-extraction from grinding too fine.
What “Coarse” Actually Looks Like
Coarse means the grounds look like coarse sea salt or demerara sugar, not sand or powder. It sits coarser than a drip grind (see our guide on grinding Colombian coffee for drip coffee for that comparison).
The reason is surface area. Cold water pulls flavor slowly through diffusion alone, since there is no heat to speed things up, so each particle gets soaked for 12 to 24 hours. Too much exposed surface from a fine grind lets harsh, woody flavors dominate the whole batch.
Use the table below to set your grinder on day one. These are starting points drawn from common community settings for these models, so expect to fine-tune by taste.
| Grinder Model | Starting Setting |
| Baratza Encore | 30 to 34 |
| Fellow Ode Gen 2 | 9.0 to 11.0 |
| Comandante C40 | 32 to 38 clicks |
| Timemore Chestnut C2 | 24 to 28 clicks |
| 1Zpresso JX-Pro | About 4 full rotations |
Even a great setting can’t fix stale beans. Our article on how fresh Colombian coffee should be for cold brew covers what to look for before you grind.
If you need a reliable entry-level burr grinder, the Baratza Encore covers this range easily. For a premium single-dose option, the Fellow Ode Gen 2 is another strong pick.
- Key Specifications (Encore): 40 mm conical steel burrs, 40 stepped settings, roughly 0.8 g/s grind speed.
- Key Specifications (Ode Gen 2): 64 mm flat burrs, stepped adjustment with 11 settings plus 31 micro steps per setting, single-dose hopper.
Why Colombian Beans Need This Attention
Colombian coffee is usually washed Arabica, grown high in the Andes, and it carries bright citrus and apple-like acidity with caramel sweetness. Sweet Maria’s Coffee Library notes that high-grown Colombian lots are dense, hard beans that resist fracturing when lightly roasted.
That density has a direct grinding consequence. Dense, lightly roasted beans extract more slowly in cold water, while darker roasts shatter into more fine dust during grinding, which is exactly what ruins a long cold steep.
So roast level shifts your starting point slightly. Light roasts of Colombian coffee often need a touch finer and a longer steep to avoid a thin, sour cup.
- Light to medium-light roast: go slightly finer, closer to medium-coarse, and steep longer.
- Medium to dark roast: stay coarse or extra-coarse, and cap the steep shorter.
This is also why pre-ground Colombian coffee rarely shines in cold brew. Bagged grounds are usually sized for drip, which is finer than cold brew wants, especially for espresso-style dark roasts (a topic we cover separately in grinding Colombian coffee for espresso).
Fixing a Brew That Tastes Wrong
Taste diagnosis is the fastest way to dial in your grind. Sour, vinegary, or watery cold brew can indicate under-extraction, so adjust the grinder one or two settings finer or steep a few hours longer.
Bitter, drying, or muddy cold brew often points to over-extraction or fines clogging your filter. Adjust one or two settings coarser, and run your filtration in two stages, meaning a metal or cloth first pass followed by a paper filter.
The Specialty Coffee Association’s cold brew research supports this slow-adjust approach. Its brewing standards work indicates optimal extraction over long steeps happens with coarse profiles combined with extended contact time, rather than fine grinds and short steeps.
Here is the key connection most guides miss: a weak cold brew is not automatically a grind problem, because grind and dose work together. If you ground properly coarse but still taste thin, your ratio is the real lever, not your setting.
Ratios to Pair With Your Grind
Grind size sets extraction quality, but ratio sets strength, and they are easy to confuse. Expect a coarse grind to hold fairly steady while your recipe changes by use.
According to the Specialty Coffee Association’s cold brew standards work, ready-to-drink cold brew typically lands at 1:12 to 1:15 coffee to water by mass. Concentrate intended for dilution with milk or water runs much stronger, at roughly 1:4 to 1:5.
Use the table below to choose your ratio before you grind the batch.
| Target Style | Coffee : Water (by mass) | Example Batch |
| Ready to drink | 1:12 to 1:15 | 70 g coffee to 1000 g water |
| Concentrate | 1:4 to 1:6 | 200 g coffee to 1000 g water |
Weighing beats scooping here, since bean density and roast level change how much fits in a tablespoon. A simple 0.1 g digital scale makes repeatable batches possible.
A dedicated brewer helps too. The Tolapac cold brew maker with filter keeps coarse grounds submerged cleanly for the full steep.
- Key Specifications: stainless steel mesh filter, 2-quart capacity, dishwasher-safe components.
Steep time mainly depends on temperature: refrigerated batches generally need the longer end of 16 to 24 hours, while room-temperature steeps finish faster. Keep filtered water on hand, since good cold brew starts with good water.
The Fine Particles Nobody Talks About
The real enemy of cold brew is not boulder-size grounds, it is the fine powder mixed among them. Barista Hustle’s cold brew research explains that fines under about 100 microns extract almost instantly, even in cold water, and dump bitterness into a 16 to 24-hour steep.
This reframes your goal when grinding Colombian coffee: you want uniform coarse particles, not just “coarse.” A quality burr grinder produces fewer fines than a blade grinder, which smashes beans into every random size at once.
That is one place worth spending money. Blade grinders cannot give you an even coarse grind, so a burr grinder is effectively required equipment for cold brew. A compact hand option like the Comandante C40 hand grinder delivers very even coarse grounds.
- Key Specifications: stainless steel conical burrs, click-based adjustment, roughly 48 clicks per full rotation.
Skim off floating grounds, decant gently, and discard the muddy final pour. Those last sips carry most of the sediment no matter how well you ground.
Cold brewing is forgiving compared to hot methods, which is why coarse is safe advice for Colombian beans. Even a slightly-off grind usually yields a drinkable, low-acid batch you can fix next round.
Start at coarse, 1:14 for ready-to-drink strength, and 18 hours in the fridge with your Colombian beans. Then taste, move one setting finer if it is sour or coarser if it is bitter, and rebuild the batch.