From preserving foods to creating home décor, Mason jars have many uses. But no matter what you use them for, you’ll want to know the ins and outs of using them properly. That’s why we’ve compiled the following list of the most frequently asked questions about Mason jars to ensure your safety and satisfy your curiosity.

Are Mason Jars Dishwasher Safe?

Yes! Mason jars can be washed by hand or in the dishwasher. However, the metal Mason jar lids may become worn down by detergents. We encourage you to wash and sterilize your Mason jars by hand for the best results. Also, make sure you treat the jar’s lid and seals with the same care. If you are placing your jars and lids on a towel to dry, make sure the towel is fresh and clean.

Woman dipping Mason Jar into boiling water.

Can I Pour Boiling Water Into a Mason Jar?

Yes, you can pour boiling water into your Mason jars, and you can also insert them into a pan full of boiling water for sterilization. However, make sure your Mason jars are at least room temperature before placing them into the water. It is even better to let your jar heat along with the water’s temperature instead of putting it in the water after it has reached its boiling point. If the jar is too cold, lowering the jar into the boiling water may cause the jar to break.

Can I Put My Mason Jar in an Oven?

No. Keep your Mason jars out of the oven. Kacey Christian from the National Center for Home Food Preservation says that oven processing times are inaccurate, the temperature fluctuates too much, the oven’s dry heat is unsafe, and the jars are much more likely to shatter.

Mason jars sitting on a shelf with food in them.

How Long Will Food Last in a Mason Jar?

If sealed and stored correctly in a cool and dark place, the National Center for Home Food Preservation says that canned food will retain its quality for 12 to 18 months in a Mason jar. It is important to remember that the condition of the food will degrade as more time passes. Regularly reorganize your Mason jars by date and check the seals to determine the condition of your canned goods.

11 Mason jars lined up in order of size from largest to smallest.

What Are Some Mason Jar Sizes?

Mason jars come in a variety of sizes and sets:

Are Mason Jars Recyclable?

Yes! For safety reasons, however, you should separate the glass from other recyclables due to Mason jars’ tendency to shatter. We recommend that you instead try to sterilize your Mason jar and reuse it. Packaging food is not its only purpose as these jars can also be used for arts and crafts, and a whole array of DIY projects.

What Causes Mason Jars to Break?

There are several reasons why a Mason jar might break, including, but not limited to:

What Do I Do If My Mason Jar Lid Gets Stuck?

If you find yourself unable to remove your Mason jar lid and seal, first try running it under hot water for at least 30 seconds. It does not need to be boiling, as the goal is just to get the lid to expand. You do not need to get the glass jar wet either. If that does not work, try using rubberized gloves that will allow you to get a better grip on the jar’s lid. We do not recommend attempting to pry the jar open with a knife or any other tool for safety reasons.

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