A common question we have is about fall and winter water needs for landscaping. Do you need regularly water up until the day it snows? Should you water if we have a warm spell. A few points might answer some of these questions.
How much water does a tree use in the fall?
In the fall cool temperatures and deciduous trees and shrubs losing their leaves dramatically reduces the need of transpiration.  Transpiration (release of water and gases) is a normal function of the leaf.  It occurs day and night. A plant uses 90% of the water it takes in to perform transpiration, but this reduces dramatically once the tree is entering August.
