These planters are frost resistant, however, it is important that they don't stand directly on the ground in the event of frost. Most planters have feet at the bottom, which means they are already off the ground so nothing has to be done during frost conditions. For any planter that does not have feet, we recommend placing them on a shelf or saucer. Furthermore, we recommend keeping the drainage hole in the middle of the each planter free from any kind of soil, so the water can always drain out.