How to Froth Soy Milk: 5 Tips for a Silky Soy Latte

SOYCLUB Editorial · 2026.10.19 · 6 min read

Yes, soy milk froths. How to use a steam wand or handheld frother, why 55–65°C matters, latte art tips and how to stop soy milk curdling in coffee, for baristas and home.

A barista steaming milk in a stainless steel pitcher — Photo: Unsplash

Why soy milk can froth

Foam forms when proteins wrap around tiny air bubbles. Like dairy milk, soy milk contains protein, so it froths too. A rich, flavourful whole soy milk makes silkier foam that holds its shape in coffee.

Tip 1: keep it between 55–65°C

This is the most important rule. Soy milk is more sensitive to heat than dairy: above 70°C the foam gets coarse, a skin may form and it curdles more easily in coffee.

In a café, use a thermometer or temperature sticker so every cup is the same.
Without one: if you can hold the bottom of the pitcher for about 3 seconds before it feels too hot, it's around 60°C.

Tip 2: start with cold soy milk

Use soy milk straight from the fridge. The colder it starts, the more time you have to texture it and the finer the foam. Fill the pitcher only about a third full to leave room for expansion.

Tip 3: aerate first, then spin

Aerate: place the steam tip just below the surface and let air in for 3–5 seconds with a gentle hiss.
Spin: lower the tip slightly so the soy milk whirls, breaking big bubbles into microfoam.
Stop: turn off the steam at about 60°C, tap and swirl the pitcher until the surface looks glossy.

A barista pouring frothed milk into a cup of coffee — Pour soy foam into the coffee right away · Photo: Unsplash

Tip 4: a handheld frother works at home

No espresso machine? Heat soy milk to about 60°C and froth with a handheld frother for 20–30 seconds, or pump it quickly 15–20 times in a French press.

Tip 5: move fast, pour slowly

Pour right away: soy foam sets faster than dairy foam, so latte art gets harder the longer you wait.
Warm the cup: less temperature difference between coffee and soy milk means less curdling.
Start slow: pour a thin stream first so the soy blends in, then bring the pitcher close to draw the pattern.

Latte art in the shape of a leaf on a cup of coffee — With the right temperature, soy milk can make clean latte art too · Photo: Unsplash

Avoid curdling in coffee

Soy proteins can clump in hot, acidic coffee. Choose a lower-acid medium-dark roast, keep the soy milk under 65°C and pour slowly, and most curdling disappears. More detail in how to make a soy latte.

Notes for cafés

Shake soy milk before use; refrigerate after opening and use it up soon.
Wipe and purge the steam wand straight after every pitcher.
List "plant milk option: soy (contains soy)" on your menu so customers can spot the allergen.

Want to launch a soy latte? The SOYCLUB partner programme offers samples and handling tips. See also our soy drink menu ideas.

FAQ

Can you froth soy milk?

Yes. The proteins in soy milk trap air to form foam. A rich whole soy milk gives silkier foam with more structure.

What temperature should soy milk be frothed to?

Aim for 55–65°C. Above 70°C the foam turns coarse, a skin can form and the milk is more likely to curdle in coffee.

Why does soy foam collapse quickly?

Usually it was frothed too long, too hot, or the soy milk was too thin. Pour it into the coffee straight away; soy foam doesn't like to wait.

How do I stop frothed soy milk curdling?

Warm the cup first, use a lower-acid medium-dark roast, keep the soy milk below 65°C and pour it into the coffee slowly.