When using my Pyrex bakeware, I put them straight from freezer to oven several times (wiping off the extra water or frost on the outside of the container first). It was fine. Nothing shattered. That being said, I know shattering does happen. I had a pan shatter on me a few years ago, completely unrelated to freezing, and it was slightly traumatic. I would feel really sad to get comments with reports of your shattering glass dishes, so you'll have to decide for yourself what you feel comfortable with. Here's what the internet says: From Pyrex (a little unclear) From America's Test Kitchen (they say yes, it's fine) From Cooks Illustrated (they say no, don't do it) From the people of the internet (most say yes, it's fine) If you want to be 100% safe, here are a few alternative things you can do: Thaw your oven-bound recipes in advance. Use aluminum pans which will not shatter. Line your frozen glass containers with parchment so you can pull your lasagnas out and transfer them into a room-temperature pan for baking.