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Ball® makes mason jars specifically for freezing. They're made with a straight shoulder. That means there's no curve around the neck of the jar, which makes it easier for them to stand up to low temperatures and expanding liquids. Freezer-safe mason jars like these don't curve in toward the lid.
Likewise, can or freeze jars?
It is important to only freeze in jars that do not have shoulders (jars that are straight sided or “tapered”) are the easiest because the contents can expand upward in the jar during freezing, especially if you're freezing liquids (jams, jelly, soup, broth, etc).
Moreover, are Kerr Mason jars freezer safe?
Wide mouth Kerr jars are available in 1/2 US pint ( 250 ml), 1 US pint ( 500 ml), and 1 US quart (1 litre). The jars themselves are dishwasher safe. They take standard size mason jar lids and ring bands. Note that, as for all mason jars, if you want freezer-safe ones you need to look for straight-sided jars.
Yes, you can freeze in mason jars. First of all, if the jars do decide to have an earth shatteringly good time in your freezer, the breaks tend to be clean and kept intact by the frozen liquid.