Kelli, I feel for you with the drought your state is having. I would water in the coolest part of the day or night, if it were my lawn I would not water it and use the water for the trees. Could you change your lawn into a desert landscape with plants that can take little water, some of them are quite attractive and would take less maintenance. Also if you have some grey water that you could use to water your trees that might help them survive. I know I am not in your climate but I have visited the southwest. Good Luck!
