Established Sod
Fall/Winter Months
Water your lawn about once a week during the winter season.
A big misconception about grass is that you don't have to water it during the winter because the grass has gone dormant and it is no longer growing. This is not true. The root system is still very much alive and does need water about once a week.
If grass is not watered at least once a week, when dormancy ends towards the beginning of spring, your grass will not appear green. It may appear thin, discolored and unhealthy.