Can kent pottery go from freezer to oven?

My guess would be no. I had put a room temperature piece in the oven at 400 degrees for 15 minutes, then turned it down to 325. I heard a snap sound in the first 10 minutes but didn't make the connection. When I took it out there was a crack down the middle. I would say it probably can't be used over 350 degrees and a shock from freezer to oven wouldn't work.