Every summer afternoon someone at my counter orders a cold brew, watches me spoon a white cap on top, and asks how to do it at their kitchen sink. My answer barely changes. How to make cold foam at home comes down to milk that's properly cold and not too fatty, a tall narrow glass, and a frother held near the surface long enough to pull air in. Below is the way I teach it, from picking the milk to rescuing a runny batch, plus a sweet cream version and two methods that need no frother at all.
The short version
- Use milk straight from the fridge; skim gives the most stable foam, 2% a creamier one.
- Froth in a tall, narrow container filled no more than halfway.
- Keep the whisk just under the surface first to add air, then lower it to refine the bubbles.
- Well-made nonfat cold foam held about 30 minutes on an iced latte in Epicurious testing.
What cold foam is, and why it isn't whipped cream
Cold foam is just milk whipped full of air with no heat involved. The proteins in the milk wrap around tiny bubbles and knit into a soft web, which is why it floats and then slowly sinks into the coffee. Whipped cream is a different animal. It leans on a lot of fat, and those fat globules clump together around the air until the whole thing stands up stiff. Epicurious puts it plainly: fat weighs a milk foam down and makes it collapse sooner. So when you want cold foam, you reach for leaner milk, not richer.
The best milk for cold foam
Customers usually blame their frother first. In my experience the carton is the bigger problem. A dairy science review by Huppertz (2010) found milk fat works against both forming and holding a foam, and it's worst around 20°C, when the fat is partly crystalline. Epicurious saw the same thing at home: skim foam lasted longest and felt smoothest. Fattier milk still foams. It just comes out heavier and gives up sooner.
| Milk | Foam result | Best for |
|---|---|---|
| Skim (nonfat) | Tallest, most stable, light texture | Classic cold foam on cold brew |
| 2% milk | Creamier, a little less height | Everyday iced lattes |
| Whole milk | Rich but heavier; collapses sooner | French press method |
| Half-and-half or cream mix | Thick, dessert-like, closer to whipped cream | Sweet cream cold foam |
| Barista-blend oat or soy | Foams well thanks to stabilizers | Dairy-free drinks |
| Regular almond or oat | Often thin and fast to collapse | Only if it's all you have |
Plant milk is a separate story. Epicurious found the stabilizers decided the result far more than whether it was oat, soy or almond, so a barista blend is worth paying a little more for.
How to make cold foam with a handheld frother
Once the milk is sorted, the cheapest tool does a fine job. I keep a handheld electric milk frother by the ice bin for exactly this. It has three speeds (4,500, 6,000 and 8,000 rpm) and charges over USB-C, and starting on the slowest one saves you from wearing the milk.
- Pour cold milk into a tall, narrow glass or jug, filling it halfway at most. Around 80 to 120 ml is plenty for one drink.
- Stir in any syrup now, while it can still blend in evenly.
- Lower the whisk into the milk before you switch it on, then start on the lowest speed.
- For the first 10 to 15 seconds, keep the whisk just under the surface so it sucks in air. Listen for a soft hiss.
- Then drop the whisk deeper and move it slowly up and down to chop big bubbles into small ones.
- Stop when the foam looks thick and glossy but still pours, usually 20 to 40 seconds all in. Switch off before you lift it out.
Rinse the whisk under the tap right away. Milk that dries on the coil is a real chore to scrub off later.
Letting an automatic frother do it
If iced drinks are a daily habit rather than a weekend treat, a jug that does it for you starts to make sense. The 5-in-1 automatic milk frother has its own dense cold foam setting. Pour cold milk to the fill mark for that mode, turn the dial, press once and go pull your shot. Respect the line, because the foam grows. And remember it won't chill anything for you; warm milk in means warm foam out.
How to make cold foam without a frother
No gadget? Grab the French press. Pump the plunger fast through cold milk for 30 to 60 seconds. In the Epicurious tests this gave the richest, most velvety foam of the lot, and it was the only method that did whole milk justice. The catch is volume: the plunger never reaches the bottom, so you need more milk than you'll use. A sealed jar shaken hard will get you something, though it scored worst. An immersion blender works too, if you don't mind the noise.
Sweet cream cold foam at home
The café-style sweet cream version is a richer thing altogether. A popular copycat recipe from Oh, How Civilized uses 1/4 cup heavy cream, 2 tablespoons 2% milk and 2 tablespoons vanilla syrup per serving, with the milk there to loosen the cream so it still pours. Froth it briefly and keep your eye on it. Cream thickens in seconds, and a few seconds more gives you whipped cream sitting on your cold brew. If you'd rather buy one carton, half-and-half does the job, since it's already half cream and half milk.
Why won't my cold foam get thick?
When a regular tells me their foam failed, I ask the same few questions, and the answer almost always sits in this table.
| Problem | Likely cause | Fix |
|---|---|---|
| Thin and runny | Milk too warm, or whisk too deep | Use milk straight from the fridge; start at the surface |
| Big bubbles that pop | Too much air, not enough mixing | Lower the whisk after aerating to refine bubbles |
| Stiff, like whipped cream | Too much cream or frothed too long | Add milk to the cream; stop earlier |
| Collapses in a minute | High fat or regular plant milk | Switch to skim, 2% or a barista blend |
| Splashes everywhere | Container too wide or too full | Tall narrow glass, half full, lowest speed |
Serving cold foam, and how long it holds
Build the drink before you froth. Ice and coffee go in first, leaving about 2 to 3 cm of room at the top, then pour the foam slowly over the back of a spoon so it settles instead of plunging. Epicurious found nonfat foam held about 30 minutes on an iced latte, which is longer than most of us take to drink one. What you can't do is make it ahead; a jar of foam in the fridge is just milk by morning. I like a clear glass so you can watch the layers blur. The glass straw tumbler pairs a borosilicate inner cup with a steel outer cup that keeps the ice going longer.
For the coffee underneath, cold brew is the classic match, and our 550 ml glass cold brew bottle makes it overnight in the fridge without any fuss.
Recommended for you
Iced drinks
Glass Straw Tumbler, 590/600 ml
Borosilicate glass inner cup in a 304 stainless steel outer cup, with lid and straw. $29.99
View product
Cold brew base
Glass Cold Brew Coffee Bottle, 550 ml
Borosilicate body, removable fine-mesh filter, cap doubles as a cup. $34.99
View productCold foam FAQ
What is the best milk for cold foam?
Cold skim milk. It gives the tallest foam and holds it longest, because the protein does the work and fat only weighs the bubbles down. 2% is my everyday compromise when I want it creamier. If you're dairy-free, buy a barista blend; the added stabilizers are what make plant milk foam.
Can you make cold foam with a handheld frother?
Yes, and it's how I'd start. Very cold milk, a tall narrow glass no more than half full, whisk just under the surface to pull in air, then lower it to tighten the bubbles. Stop while it still pours.
Why won't my cold foam get thick?
Most of the time the milk isn't cold enough, it's too fatty, the glass is too wide, or the whisk sits too deep to ever draw in air. Go back to skim or 2% straight from the fridge, use a tall glass and start at the surface.
Can you make cold foam without heavy cream?
Easily. Plain skim or 2% milk makes a lighter cold foam with no cream at all. You only need heavy cream for the richer sweet cream version.
How long does cold foam last?
In Epicurious testing, well-frothed nonfat foam held a fluffy cap on an iced latte for about 30 minutes. It won't keep, though. Put it in the fridge and it slumps back into milk, so froth it right before you pour.
Is cold foam the same as whipped cream?
No. Cold foam is held up by milk protein trapping air, so it stays soft and pourable. Whipped cream depends on fat globules locking together around the air, which is why it stands up in stiff peaks.
One habit worth stealing from behind my bar: put the glass you froth in into the freezer for ten minutes before you start. The milk stays colder while you work, and the foam comes out noticeably tighter.
Pick the frother that matches how often you drink iced coffee.
Shop milk frothersSources
- Epicurious: How to Make Fluffy, Cloudlike Cold Foam at Home, for the milk and tool tests, skim milk's stability, barista-blend plant milks, the French press result and the roughly 30-minute hold on an iced latte.
- Huppertz (2010), Foaming properties of milk: a review, International Journal of Dairy Technology, for why milk fat hurts foam formation and stability, especially around 20°C.
- Oh, How Civilized: Starbucks-style vanilla sweet cream cold foam, for the copycat sweet cream ratio of 1/4 cup heavy cream, 2 tablespoons 2% milk and 2 tablespoons vanilla syrup.
- Product details checked on Yozcoffee listings, 2026-10-24 Asia/Shanghai.