Posted on January 6, 2016 by The Zero-Waste Chef
When I post pictures of my jar-filled freezer on social media, I get lots of questions about it, usually along the following lines:
Is it safe to freeze food in glass? (Yes)
Do you use special glass for the freezer? (No)
Don’t your glass containers break? (Only that one time…)
I have had little trouble freezing food in glass. I do however take a couple of precautions:
Always leave headspace when freezing liquids. I prefer wide-mouth jars for freezing or at least jars without shoulders (i.e., straight sides all the way up to the top). I have broken only one glass container in the freezer—it’s one of those things you do only once. I filled a narrow-neck milk bottle with liquid (likely broth, I forget exactly). Even though I had left head space, when the liquid froze, it expanded and snapped the narrow neck cleanly off the (very nice) bottle. Oops.
Occasionally I’ll use pyrex round or rectangular containers with plastic lids, which I bought before I went plastic-free. I don’t use these very often in the freezer because I like to keep the glass portion of them free for roasting food.
Don’t overstuff your freezer with jars stacked all over the place willy-nilly. When you open your freezer door, jars might fall out onto the floor and break.