Extra-Coarse for Cold Brew: What It Suits and How to Get It Right

Pour cold brew concentrate over ice and you'd swear it came from a different bag of beans entirely — mellower, rounder, almost sweet. Most of that shift comes down to one decision made long before the water ever touches the grounds: cold brew grind size. Get it right and you're steeping your way to something smooth and full-bodied. Get it wrong and you're either waiting on a weak, watery jug or straining silt out of your glass for the next hour. It's a small thing to get right and it changes the whole drink.

Why Cold Brew Grind Size Matters

Every other brew method on the shelf uses heat to speed things along. Cold brew doesn't. It steeps for 12 to 24 hours at room temperature or in the fridge, letting time do the work heat usually handles. That long, slow contact changes the math on grind size completely. A grind fine enough for drip or espresso would sit in that jug for a full day and pull out everything, including the bitter, sour compounds that make a brew taste harsh instead of rich. This is exactly why cold brew grind size sits at the coarse end of the scale, well past what most people are used to scooping.

What Extra-Coarse Actually Looks Like

If your only reference point is a bag of pre-ground coffee from the grocery aisle, extra-coarse is going to look like a mistake the first time you measure it out. It shouldn't resemble sand or table salt — think coarse sea salt, or breadcrumbs you'd sprinkle on a casserole. Each piece should be visibly chunky and uneven, noticeably bigger than what you'd use for a French press. That's not us being fussy; it's what keeps a 24-hour steep from turning into sludge. At LocoYoko we roast to order in Toronto and grind at checkout, so if you're ordering for cold brew, just select extra-coarse and it arrives ready — no home grinder required, though one certainly helps if you're dialing things in yourself.

Grind size doesn't mean much if the grinder itself can't hold a consistent size. Blade grinders chop beans with a spinning propeller, which means every batch comes out uneven — some pieces near-powder, others barely cracked. For a quick pot of drip that unevenness is forgivable. For cold brew it's a problem, because the fine dust a blade grinder leaves behind over-extracts fast, muddying a concentrate that's supposed to be clean and mellow. A burr grinder crushes beans between two consistent surfaces instead, so a coarse setting actually stays coarse from the first scoop to the last. If you're grinding at home, it's worth the upgrade. If you'd rather skip the hardware altogether, order your bag with the grind selected at checkout and let the roaster handle the consistency for you.

Ratio, Steep Time and the Basics

Once the grind's sorted, the rest of cold brew is patience and proportion. Most people land somewhere between a 1:4 and 1:8 ratio of coffee to water for a concentrate, then dilute that concentrate with water, milk, or ice before drinking. Steep for 12 to 24 hours — longer isn't always better, it just gets stronger and occasionally more bitter past the 24-hour mark. Strain through a fine mesh bag, cheesecloth, or a paper filter to catch the fines that inevitably slip through even a careful extra-coarse grind. For the exact numbers, our coffee-to-water ratio chart breaks down starting points by method, cold brew included.

Common Grounds: Why the Coarse Grind Isn't Optional

It's tempting to think this is just common grounds coffee advice that doesn't really matter, that any grind will do if you steep it long enough. It won't. Go fine, or reach for whatever's left over from a bag of already-grinded coffee beans meant for drip, and you'll get a concentrate that's cloudy, muddy in the mouth, and noticeably more bitter than it should be. The fines also clog filters and leave grit at the bottom of the glass that no amount of straining fixes. Whether your regular stop for a cup is a spot like Fair Grounds Organic Café & Roastery or you're brewing entirely at home, the logic holds everywhere: cold brew wants chunky, not fine.

Quick checklist before you steep

• Grind extra-coarse, closer to sea salt than sand
• Use filtered water and a clean jar or pitcher
• Steep 12–24 hours in the fridge or at cool room temperature
• Strain through a fine mesh bag or paper filter, twice if needed
• Dilute the concentrate to taste before drinking

Most cold brew complaints trace back to grind size, even when it doesn't look that way at first. A concentrate that tastes sharp or bitter usually means the grind ran finer than it should have, or the steep went past 24 hours and pulled out more than it needed to. A jug that tastes thin and watery is often the opposite problem: too coarse, too short a steep, or too little coffee for the amount of water. And if you're finding grit or sediment at the bottom of your glass no matter how carefully you pour, the fix is almost always in the straining — run it through a paper filter after the initial strain, or double up on cheesecloth. None of these are hard fixes; they just point back to the same two variables, grind size and time, so it's worth adjusting one at a time rather than guessing.

Getting It From Bag to Glass

If you're ordering online, look for beans sold in resealable coffee ground pouches with a one-way valve — that valve lets built-up gas escape without letting air back in, which matters more for cold brew than you'd think, since a long steep gives stale grounds plenty of time to show their age. LocoYoko bags ship with a roast date stamped on them and go out within 24 hours of your order, so what lands on your counter is close to what came off the roaster. Not sure which of our coffee options fits your cold brew plans, or your usual cup for that matter? Our quiz takes a couple of minutes and points you toward a roast that matches how you actually drink coffee. Orders over CA$50 ship free, so it's an easy one to bundle with your usual bag.

What to Do With the Leftovers

Once you've strained your concentrate, don't just tip the used coffee grounds straight into the bin. They're a well-known addition to a compost pile or worked into garden soil, coffee grounds break down fast and add nitrogen as they go. It's a small thing, but it's a nice way to close the loop on a brew that already takes a full day of patience to make.

Cold brew rewards getting the small decisions right, and grind size is the one that matters most. Head to our grind guide and pick extra-coarse the next time you order — your future jug of concentrate will taste like it.