The short answer: not really. A wooden spoon can sometimes seem to help when milk is heating, but it does not reliably stop a pot from boiling over. The old trick works just enough to feel convincing, which is probably why it has survived in home kitchens for generations.
What is actually happening is pretty simple. When milk heats, steam and proteins create foam at the surface. A spoon resting across the pot can slightly interrupt that foam and give bubbles a place to break. It may also cool a tiny strip of surface by conducting a little heat away from the area touching the spoon. That can slow the foam for a moment, especially if the pot is near a gentle simmer.
But once milk gets close to a full boil, the spoon loses the battle. The foam can rise around it, and the liquid can still surge up and spill over the rim. In other words, the spoon may delay the problem, but it does not solve it. If your burner is too high or the pot is too small, the milk will still escape.
What works better than the spoon trick
- Use a larger saucepan than you think you need.
- Heat milk over medium-low or low heat, not high heat.
- Stir occasionally, especially as it gets hot.
- Stay close once you see steam and a skin beginning to form.
- Use a heavy-bottomed pot if you heat milk often, because it spreads heat more evenly.
If you want the most reliable prevention, control the heat. Milk boils over because the surface foams faster than the liquid can settle, so reducing heat is far more effective than balancing a spoon across the rim. A watchful eye matters too, since milk can go from calm to overflowing very quickly.
So the wooden spoon is not a myth, exactly, but it is not kitchen magic either. Think of it as a small, temporary nudge against foam, not a safeguard. For everyday cooking, the safest habit is simple: keep the heat modest, use enough pot space, and do not walk away from milk on the stove.