How Long Should You Water New Grass?
New grass should be watered daily for the first two weeks with enough water to moisten the soil to a depth of 4-6 inches. After the first two weeks, reduce the frequency of watering to every other day or every two days, gradually increasing the amount of water each time to encourage deeper root growth. Once the grass is established, it should be watered deeply once or twice a week, depending on weather conditions.