Can You Put Mason Jars In The Microwave? (Find Out Now!)

Emily Carr
by Emily Carr

Mason jars have become an aesthetically pleasing option for storing food, holding your iced coffee, or as a simple household cup. If you can store food in it, can you put Mason jars in the microwave too?

You can put Mason jars in the microwave, as long as there is a ‘Microwave Safe’ symbol on the bottom. Remove the lid and fill the container up 3/4 of the way to allow for expansion and limit shattering. Make sure your microwave is set on ‘medium’ or ‘low’ power and reheat your food in 1-minute increments.

Follow along to learn if it’s safe to put mason jars in the microwave and how many times you can do so per jar. This article will also cover what not to do when microwaving a Mason jar.

Let’s dive right in!

Is It Safe to Put Mason Jars in the Microwave?

Mason jars were invented in the mid-1800s by a man named John Landis Mason. Now, we see them almost everywhere as a storage container for fruit preserves or even moonshine! With so many applications, is it safe to microwave these bad boys?

You can put some of the newer model Mason jars in the microwave. Just look for the ‘Microwave Safe’ symbol on the bottom of the jar.

While glass, in general, is safe to reheat in because it’s non-reactive, it also expands as it’s exposed to heat. If the temperature change is too rapid and severe, it could damage your cup.

Additionally, you never want to thaw anything stored in a Mason jar using the microwave or oven. There are a few best practices to follow in order to make sure that your Mason jar doesn’t shatter.

The Best Way to Microwave Mason Jars

In order to ensure your safety, Mason jars and any glass material should be handled with special care.

The best way to microwave a mason jar includes:

  • Locate the ‘Microwave Safe’ symbol on the bottom of the jar you wish to reheat.
  • Make sure the jar and its components are at room temperature before proceeding.
  • Remove the metal lid.
  • Fill the container up 3/4 of the way.
  • Ensure there isn’t a label with ink or anything written in marker or pen on the container (this will leak onto your food). Instead, opt for a plain jar to use in the microwave.
  • Only use one Mason jar at a time.
  • Set your microwave’s power setting to ‘medium’ or ‘low.’
  • Use 1-minute increments to reheat your food.

While it’s perfectly safe to microwave a Mason jar, it still may be warm to the touch when you remove it. Use oven mitts or a towel to guard your hands against getting burned.

What About Mason Jars without a ‘Microwave Safe’ Indicator?

Older Mason jars without the ‘Microwave Safe’ symbol might also be suitable for nuking as long as they don’t have any metal, rubber, plastic, or inked parts.

If you’re going to give it a shot, start with 10-second intervals and don’t exceed a full minute of microwaving. However, it’s always best to stick to the jars with an appropriate safety label!

How Many Times Can You Microwave the Same Mason Jar?

This question is a little tricky- it really depends on the mason jar you have (size, brand, etc.) and your microwave.

Generally speaking, you should be able to microwave a microwave-safe Mason jar 100 times or more before the glass or container begins to show wear. This is considering that you’re doing so appropriately.

After a while, glass may retain microscopic cracks that are invisible to the naked eye. They can be caused by something as small as setting your Mason jar down too hard or continuing to expose it to extreme temperatures.

Regardless, in order to prevent the glass from breaking, swap out your Mason jars every couple of years.

What Not To Do When Putting Mason Jars in the Microwave

Now that we’ve gone over how to handle microwaving a Mason jar, what shouldn’t you do?

Avoid the following things when microwaving your Mason jar:

  • Leaving the metal lid on
  • Microwaving more than one Mason jar at a time
  • Attempting to defrost or heat up food that’s colder than room temperature
  • Heating a jar that has rubber, metal, marker, pen, or plastic on it
  • Running your microwave on ‘high’ power
  • Nuking your food for longer than 1-minute at a time

All of these are prohibited in the effort to be safe and prevent you from having to clean up an accident down the line.

Can you Put Mason Jars in the Oven?

This is over a follow-up question because, well, microwaves are a quicker, smaller version of an oven. Does that make them safe for a Mason jar?

Not exactly– ovens are hotter and require high temperatures for an extended period of time. Research shows that Mason jars break or become damaged if exposed to anything higher than 300 degrees Fahrenheit.

At a minimum, most oven recipes require 350 °F to cook. Additionally, Mason jars are tall and compress food, so even if it were possible, the components would take forever to cook all the way through anyway!

Related Questions

Can you put Mason jars in the freezer?

Most Mason jars are freezer-safe but must be handled carefully.It’s important that the food or liquid you’re planning on storing isn’t extremely hot before going in the freezer. That violates the extreme temperature issue we discussed earlier in the article.Some people even recommend waiting to put the lid on until after the components are frozen due to the risk of expansion. Leave at least 25% room for the ice to grow upwards.When you take the Mason jar out of the freezer, let it thaw naturally, and don’t attempt to use excessive heat.

Can you put Mason jars in the dishwasher?

Yes, Mason jars can easily be thrown in the dishwasher!Just beware that anything written on them will likely wear off in the process. Also, wash the lids by hand as the metal aspect will rust if exposed to high-intensity hot water.The best way to do so is with a pea-sized dollop of dish soap and your hands. Avoid using a kitchen sponge or other scrubber that may have residual abrasive cleaner on it.

Are Mason jars able to hold hot coffee?

You can drink hot coffee out of a Mason jar, as long as the cup is room temperature, to begin with.Use caution when handling the jar, as glass can get extremely hot and isn’t a great barrier for warm beverages. Use a Mason jar with a handle like this to reduce the stress on your hands!

The Finale

In a nutshell, you can microwave your Mason jars as long as they’re not too cold to begin with, and have a safety label on the bottom.

It’s best practice to swap them out every 2 years and make sure the glass isn’t touching anything metal or plastic while microwaving to prevent shattering.

If you have a Mason jar that is too narrow for the amount of food you’re cooking, remove the lid and fill it only 3/4 of the way. This will allow for expansion as well as limit overheating during microwaving.

Lastly, make sure your microwave’s setting is on ‘medium power’ or lower, and cook your meal in 1-minute increments until it’s the perfect temperature!

Emily Carr
Emily Carr

Emily is a copywriter with over five years of experience in crafting content for the home renovation and remodeling industry. She loves house projects, whether it be painting a room or tweaking small design elements to transform a space. Her favorite aesthetic is french modern because of its clean lines and airy feeling! When not writing, Emily loves to travel and check out architectural details all over the world.

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