“The balancing act of watering your trees in the fall and winter is important. Newly planted trees (those planted within 1-3 years) are more susceptible to damage from dry conditions and should be watered more frequently than established trees. Try watering deeply three times a month in the FALL and twice a month in the WINTER.
Evergreen trees lose water through their needles in the dry winter air. They need more stored-up water going into the winter season to make up for that. Cold, dry winds can strip water from evergreens faster than their roots can absorb it, too. That is why it is especially important to provide enough water in the fall and during dry warm spells in the winter.
…Deciduous trees should also not get too dry in the fall and winter. Water acts as an insulator for both the tree and soil. Soil that stays moist will be warmer. Likewise, plant cells that are plump with water will be less susceptible to damage from the cold. Water deciduous trees deeply twice a month during the fall and once a month in the winter. When watering any tree, remember to apply water out to the edge of the tree’s canopy drip line. Some options for deep watering are: bury a soaker hose around the base of the tree trunk – the holes will keep the hose from bursting in freezing temps. Connect to a hose and water for one hour. Alternately, fill a 5 gallon bucket and slowly pour water out distributing as evenly as possible over the root zone.”