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I didn't know you can freeze things in mason jars in the freezer?
You can if you leave plenty of space. Maple syrup doesn't expand as much as water since most of the water is boiled out. I've frozen corn and other veggies in wide mouth jars and as long as I leave room, there are no problems. Currently, I have corn, juice, green beans, maple syrup and tomato puree in jars in my freezer
I didn't know you can freeze things in mason jars in the freezer?

You can if you leave plenty of space. Maple syrup doesn't expand as much as water since most of the water is boiled out. I've frozen corn and other veggies in wide mouth jars and as long as I leave room, there are no problems. Currently, I have corn, juice, green beans, maple syrup and tomato puree in jars in my freezer