how often do you need to water your new grass
1 Your lawn needs at least 1â-1 Â½â of water per week, year-round, during the winter, too. 2  Water deeply 2-3 times per week, rather than daily. 3  Water as early in the morning as you can, when possible.  If you canât push a 6â screwdriver into your lawn, youâre not watering enough.