Does hot water kill yeast?

In this brief guide, we are going to answer the question “does hot water kill yeast” with an in-depth analysis of whether or not the hot water kills yeast. Moreover, we are going to discuss yeast and its uses along with the reason lying behind the addition of yeast in warm water with sugar.

So without much ado, let’s dive in and figure out more about it. 

Does hot water kill yeast?

Yeast is temperature sensitive and when the temperature of the water that you are adding in the yeast increases by 120 degrees Fahrenheit the yeast begins to degrade. If the temperature of the water reaches 140 degrees Fahrenheit or above, the yeast present in the solution fully gets killed. 

This means that if your hot water has a temperature of more than 120 degrees Fahrenheit then it can kill your yeast. Therefore care should be taken in this regard or else you will be left with dead yeast that won’t be able to carry out any function. 

If we talk about the instant yeast and the active dry yeast then both of them differ in their tolerable temperature limit with instant dry yeast tolerating more hot water as compared to the active dry yeast.

For instance, if the temperature goes above 115 degrees Fahrenheit, then it is the temperature at which the active dry yeast will degrade and stops working. On the other hand, the instant dry yeast can tolerate a temperature up to 130 degrees Fahrenheit.

 A yeast population is affected by different components, the control of which is necessary for better development. 

These components include pH, temperature, nutrients availability, and the concentration of available enhancements. By sorting out which parts impact the yeast development, these components can be controlled in the fermentation process. 

This preliminary will outline to the understudy that the advancement of yeast is affected by pH, temperature, and supplement level and that one regular result of this fermentation process is carbon dioxide. 

Yeast needs warm temperatures to be activated, so while putting the dough to rise, guarantee it is sitting at a temperature that is 70 to 80 degrees Fahrenheit. Yeast dies at a particular temperature during baking bread. 

The temperature at which yeast die is around 130 to 140 degrees Fahrenheit. Regardless of the type of yeast you use, if your water reaches temperatures of 130 degrees Fahrenheit or more, the yeast will begin to die off. Once water temperatures reach 140 degrees Fahrenheit or higher, that is the point where the yeast will be completely killed off, and when the yeast gets killed it means that no matter in which dough or batter you add it in it won’t be able to carry out its leavening function.

You can read how to activate the yeast in three steps here.

Other FAQs about Yeast which you may be interested in.

What does dead yeast look like?

How long does active yeast last?

How fast does yeast multiply?

Does boiling water kill yeast?

Yes, boiling helps to either kill or damage several forms of yeast. The threshold also varies with the type of yeast, e.g. 120F for dry, and 130F for instant yeast. Theoretically, all yeasts die at a temperature of 128F.

What is yeast and what are its uses?

Yeast is related to the fungi and is a solitary celled microorganism utilized in the kitchen to make bread. While there are different types of yeast, the principal contrast is their moisture content. Yeast is the thing that is utilized to make the majority of your bread items rise. Pizza dough, cakes, and bread all include yeast for their plans, and you need to take extraordinary consideration of it to keep it alive. 

It’s the carbon dioxide that makes baked goods rise. 

Yeasts require carbohydrates, for example, sugar and starch for carrying out the biological process that resultantly makes the carbon dioxide.

Yeast has been valuable to man for quite a long time in the creation of specific food sources and refreshments. They additionally assume an underlying part in the creation of vinegar. There are hundreds of different species of yeast. It is used in fermentation, bread, and alcohol, etc. 

Why do we add yeast in warm water and sugar?

Yeast is a biological leavening agent and feeds on the sugar present in the solution. Then it liberates out carbon dioxide that is responsible for making the fluffy buns. That is the very reason that it is advised to firstly add the yeast in a bowl of warm water containing sugar so that the yeast can activate.

The commercially available yeast is present in its dormant state so that it does not react while it is in its packaging. To activate the yeast, it has to be first added in warm water with sugar, honey, or fructose syrup added in it.


In this brief guide, we answered the question “does hot water kill yeast” with an in-depth analysis of whether or not the hot water kills yeast. Moreover, we discussed yeast and its uses along with the reason lying behind the addition of yeast in warm water with sugar.