Bring potted ivy plants indoors to thaw. A slow thaw reduces the leaf burn that occurs when the ice crystals on the plant dry during warm, sunny morning hours. Once the plant thaws, prune damaged leaves. Leave the plant indoors until all threat of frost passes.
Water the plant on a regular schedule. This keeps undamaged parts of the plant healthy and hydrated. A dehydrated plant has difficulty handling the stress it undergoes when the frost on the leaves draws the moisture away from the plant tissue.
Cover outdoor ivy plants with a sheet or lightweight blanket when you have warning of a frost. Cover the plant completely to trap the warm air inside the cover and reduce exposure to wind. This reduces heat loss and protects against frost damage.
Cut away scorched leaves in the spring. Trim them after threat of frost is over to make room for new, healthy growth. If you prune the ivy during the winter months and another frost occurs, the new growth could sustain frost damage.