Whisk cold milk hard for about twenty seconds, then pour it over the top of a cold coffee. That is cold foam. The cheapest handheld frother does it properly, which is unusual for a cafe technique — most of them need either a skill or a machine, and this one needs neither.
The reason it works is worth knowing, because it explains every mistake people make with it. A steam wand does two jobs at once: it heats milk and it whips air into it. Cold foam only wants the second job. So the tool for cold foam is anything that spins fast enough to force air into liquid — a battery whisk, a jug frother on its cold setting, a jar you shake, a French press plunger. A steam wand is not a cold-foam tool at all, and a lot of people with good espresso machines are reaching for the wrong attachment.
The method
- Start with cold milk, straight from the fridge. Not room temperature, not warmed. Cold milk holds foam better and you are about to pour it onto ice.
- Use a small amount.Two to four tablespoons is a drink’s worth — NIST puts a tablespoon at 15 mL, so that is roughly 30–60 mL of milk. Cold foam roughly doubles in volume, so a small puddle becomes a generous layer.
- Whisk in a narrow vessel. A tall, narrow cup or a measuring jug keeps the milk around the whisk instead of letting it climb the sides. Hold the whisk just below the surface, where it pulls air in.
- Stop when it mounds. Twenty to thirty seconds. You are looking for the point where the surface holds a soft peak for a second and the texture looks matte rather than bubbly. Over-whisking makes it stiff, and stiff foam sits on top like a lid instead of drinking nicely.
- Sweeten or flavour before you whisk, not after. Syrup, vanilla or a spoon of sugar whisked in dissolves completely. Added afterwards it sinks through the foam and takes the foam with it.
- Pour it over the back of a spoon onto a full glass. The glass needs to be full of coffee and ice, so the foam has somewhere to sit. Poured into a half-empty glass it just mixes in.
No source we cite publishes figures for which milk foams best or at what temperature, so this page deliberately does not invent any. In practice the cues above are the ones that matter, and the same honesty applies on our cappuccino guide, which avoids publishing a milk temperature for the same reason.
What to use, ranked by what it does
| Tool | Time | What you get | Verdict |
|---|
| Handheld whisk frother | 20-30 seconds | Light, pourable foam | The default - cheap, fast, nothing to wash but a wand |
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| Electric jug frother with a cold setting | About a minute, hands off | Even, consistent foam | Best if they make one every day |
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| A jar with a lid, shaken | 30-60 seconds of shaking | Coarser bubbles, collapses faster | Works, no purchase needed, more effort |
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| A French press plunger, pumped | 30 seconds | Dense foam, surprisingly good | Free if they already own one |
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| A steam wand | Instant | Hot milk - not cold foam | The wrong tool: steam heats as well as aerates |
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What to look for in a frother for cold foam
- A cold setting, stated on the listing. This is the only specification that matters and plenty of frothers do not have it. Both electric frothers below list hot and cold modes on their own listings; a frother that only heats is the wrong purchase for this job.
- Speed over capacity, for one drink. A handheld whisk spins faster than most jug frothers and costs a fraction as much. For a single drink it is genuinely the better tool, not the compromise.
- Capacity over speed, for a household. If two or three people want iced drinks at the same time, a jug that does a batch hands-free beats whisking three cups one at a time.
- Something easy to rinse. Milk sets on a whisk within minutes. A wand you can rinse under the tap in three seconds gets rinsed; a jug with a fixed base does not, and that decides whether the thing stays in use.
- A tall glass to pour it into.Cold foam needs a full glass of iced coffee underneath it, and an insulated tumbler keeps the ice from melting into the drink while they drink it — which our cold brew vs iced coffee guide identifies as the reason home iced coffee usually tastes watery.
The gear, picked for this
Three ways to make the foam and the glass it goes on. Prices are pulled live and dated on each button.
