Are Mason Jars Oven Save? – Don’t Bake In Them

Mason jars are wonderful. You can use them for parfaits and snacks, for cool drinks, for nice gifts, lighting, and even for decoration, but the real question is can you use them to bake?

Are mason jars oven safe?

Mason jars are made of tempered glass, which is not able to withstand the hot temperatures of an oven. Once the jars reach a high enough temperature, there is a chance of thermal shock causing the glass to break and shatter.

Now that we know mason jars are not oven safe, let’s go over some safety precautions and alternative options. Read on to find out if we can add one more useful way to use mason jars to the list!

Mason Jars Near Oven

Why You Shouldn’t Put Mason Jars in the Oven

The main reason not to use them in the oven is that you cannot dry-heat mason jars to a temperature that will safely cook food without raising the temperature to a level that will crack the glass. This means the jars can not be heated enough to cook food, so there’s no other reason that you would put them in an oven.

On the Bell & Kerr FAQ, here is what they have to say to those who want to bake with their jars:

Bell and Kerr Bake FAQ

If tempered glass is placed in a hot enough oven the high temperatures will cause the mason jars to shatter. All different types of glass can shatter at certain temperatures, but the breaking point of tempered glass is very low.

Tempered Glass Risks

Canning companies create most mason jars with tempered glass. While most canning procedures include heating or boiling contents of the jars, there is a temperature limit.

You can place mason jars in boiling water, but that temperature needs to reach only 212 degrees Fahrenheit. This is a suitable temperature for mason jars.

Ovens, however, get much hotter than 212 degrees, which poses the risk of cracking the tempered glass. It is best to avoid baking things in a mason jar, for you would likely need to set the oven way over the 212-degree mark.

Most bakers need temperatures closer to 350 degrees Fahrenheit, so you can see why baking would not be a credible way of utilizing your mason jars.

Assuming the mason jars are being placed in an oven that is over 212 degrees, here are a few of the dangerous situations that we’re trying to avoid.

  • The glass will expand when heated
  • The glass will fracture into many tiny, sharp pieces
  • The glass will explode from the pressure, causing pieces of glass to be sent flying

Mason Jar Baking Alternatives

While mason jars are not oven safe, they can still be heated up! The key here is to avoid temperatures that or too hot, or the jars will crack and break.

A few safe options for mason jars are:

  • Food Storage
  • Decoration
  • Canning
  • Soups
  • Desserts
  • Storage Containers

The tempered glass that mason jars are made of cannot withstand the heat of an oven. However, it can withstand boiling temperatures, cold temperatures, and room temperatures.

While you shouldn’t freeze glass, as it will likely crack, you can store food in it and place it in the refrigerator. This opens up many options, such as overnight oats and parfaits.

Alternatively, you can store dry goods in mason jars at room temperature in order to prepare a quick snack or store sugar or rice. Finally, you can boil foods within these jars, thus opening the options of canning.

Regardless of the way you choose, it is clear that there are many options you can choose from that do not involve baking.


Let’s leave the baking to the pans and baking sheets. Mason jars are great for many things, but they are not suitable for an oven’s temperatures.

Therefore, we have to say that mason jars are not oven safe. I hope this article has helped give clarity to your mason jar queries!