When your lawn is just starting out you should keep the area constantly moist, but not soaked, until the new grass is two inches tall. This is usually accomplished by watering 2-3 times a day for 5-10 minutes at a time. After this, begin cutting back until you’re watering every other day. After a few weeks of this, cut back to three times a week. Once your lawn is fully established you can follow a more permanent schedule but remember infrequent, deep watering is better for your lawn than frequent, shallow watering. Watering every day not only encourages weed growth, it can also lead to a shallow root system since the roots have no reason to grow deeply to find moisture. This makes the grass more susceptible to drought stress if water suddenly becomes unavailable, like when water restrictions are put in place or natural precipitation fails to fall. Shallow roots are also more prone to pest problems, traffic damage, and diseases. Instead, water deeply enough to saturate the soil to a depth of 6-8 inches. Do this once or twice a week max. To find out if you’re watering deep enough, grab a shovel and start watering you lawn. Dig up a small section of your lawn every 15 minutes to find out how long it takes for water to seep 6-8 inches down. Once you know how long it takes, set your sprinkler system to water for that duration every time.