---
title: "Rolling boil: what it means in cooking — Tiny Plates"
description: "A rolling boil is water boiling so hard that large bubbles churn the whole surface and do not stop when you stir. It is what pasta and blanching need."
url: "https://www.tinyplates.dev/glossary/rolling-boil"
---

# Rolling boil

A rolling boil is water boiling so hard that large bubbles churn the whole surface and do not stop when you stir. It is what pasta and blanching need.

Also called Full boil, Hard boil, Full rolling boil.

A rolling boil is the most vigorous kind of [boil](https://www.tinyplates.dev/glossary/boil). Large bubbles rise quickly and constantly from the whole bottom of the pot, so the surface rolls and churns. The key sign is that stirring does not stop it. Pasta, [blanching](https://www.tinyplates.dev/glossary/blanch), jam setting and sterilizing all call for a rolling boil.

## How to do it

1. Use a large pot and plenty of water, so adding food does not cool it too much.
2. Put on a lid to [bring it to a boil](https://www.tinyplates.dev/glossary/bring-to-a-boil) faster.
3. Heat over high heat.
4. Take off the lid and check. When large bubbles cover the whole surface and keep going while you stir, it is a rolling boil.
5. Add the food. The boil will slow for a moment. Keep the heat high until it returns.

## How to tell it is done

Here is how the stages look, from gentle to strong:

* Steam and tiny bubbles on the bottom of the pot: hot, not simmering.
* Small bubbles rising gently and breaking the surface: a [simmer](https://www.tinyplates.dev/glossary/simmer).
* Large, steady bubbles across the surface that calm down when stirred: a boil.
* Large, fast bubbles all over that do not calm when stirred: a rolling boil.

At sea level, water at a rolling boil is 100°C (212°F). It is no hotter than a gentle boil, but it recovers heat faster when food goes in.

## Why it works

The heat input is high enough that the water stays at its boiling point even as you add cold food or stir. For pasta, the constant movement keeps pieces from sticking together, and the water returns to the boil quickly so the pasta does not sit in hot, still water and turn gluey. For jam, a rolling boil drives off water fast enough to reach setting point.

## Common mistakes

* Adding food before it is at a full boil. Pasta gets sticky and cooks unevenly.
* Too small a pot. It overflows or loses the boil.
* Keeping a rolling boil for stocks, stews or meat. These need a gentle simmer. Boiling hard makes meat tough and stock cloudy.
* Covering a pot of pasta at a rolling boil. It foams over.

## In recipes

"Bring to a rolling boil" means wait until stirring cannot calm it. In jam recipes, "a full rolling boil that cannot be stirred down" means the same thing.

## Related terms

* [BoilBoiling cooks food in water heated to 100°C (212°F) at sea level, where big bubbles break the surface. It is used for pasta, potatoes, eggs and grains.](https://www.tinyplates.dev/glossary/boil)
* [SimmerA simmer is liquid kept just below boiling, with small, gentle bubbles rising to the surface. It cooks soups, stews and sauces without toughening them.](https://www.tinyplates.dev/glossary/simmer)
* [Bring to a boilTo bring to a boil is to heat a liquid until large bubbles rise and break across the whole surface. Here is how to tell, and why recipes then turn it down.](https://www.tinyplates.dev/glossary/bring-to-a-boil)
* [BlanchBlanching is cooking food for a short time in boiling water, then stopping the cooking in ice water. It sets color and loosens skins.](https://www.tinyplates.dev/glossary/blanch)
* [Al denteAl dente is Italian for to the tooth. It describes pasta or vegetables cooked until tender but still firm in the center, with a slight bite when you chew.](https://www.tinyplates.dev/glossary/al-dente)

[More in doneness and temperature](https://www.tinyplates.dev/glossary/category/doneness-and-temperature)[Every term from A to Z](https://www.tinyplates.dev/glossary)