Our stoneware is oven safe when placed in a COLD oven that is then brought up to temperature. Placing a cold piece of pottery into a hot oven can cause it to crack and break from the sudden temperature change. Our stoneware is also microwave safe EXCLUDING our plates. Heating food on our plates can create concentrated hot spots that stress the pottery, causing cracks. Also, certain glaze patterns will heat up quickly and may be hot to the touch, so take care when removing pottery from the microwave.