Oriental lilies are hardy bulbs that should be able to survive the winter outdoors depending on where you live. Any plant left in a pot is more exposed to the cold so I would either move the pots to a protected location under the eaves or into a garage so they won't freeze. Or, dig up the bulbs now and replant them into the ground before a hard frost. Most bulbs will die from rot when they get too much moisture, so make sure you place the bulbs in well drained soil or even a raised bed. Another thing to avoid is letting any potted bulbs sit near a gutter that overflows, as wet soil all winter will rot the bulbs. Keep growing, Marianne Binetti