Water as needed throughout the winter when soils are cool but not frozen, and there has been little precipitation. Winter droughts need treatment with water just as summer droughts do. Deeply water trees with a slowly trickling hose or slowly running sprinkler left in place for a couple hours. Do not use 'root feeders' or deep root watering devices. Apply the water slowly enough that it can soak in and does not run off.
Winter is a difficult time for trees.
They stand in the face of cold, drying winds and continue to lose water throughout the winter. For the sake of your tree's continued health, take a few minutes this fall to winterize your tree.