Most lawns need 1 to 1.5 inches of water per week—either from rain or watering—to soak the soil that deeply. That amount of water can either be applied during a single watering or divided into two waterings during the week.
The amount of water you need is generally 1 to 1.5 inches per week, but it can vary depending on your grass type, the climate you live in, your soil type, and the age of your lawn. In general, you want the top 6-8 inches of soil to be moist, but not soggy—which translates to 1 to 1.5 inches per week.
It is ideal to water lawns about one inch of water per week. To determine how long you need to water to get one inch, place a plastic container in your yard and set a timer. On average, it will take 30 minutes to get a half inch of water. So, 20 minutes, three times per week will give a lawn about an inch of water.
A related question is how often to water your lawn. You do not have to provide the required 1 inch per week all at once. Instead, you can water for 30 minutes twice a week. But some experts advise against extending irrigation sessions beyond that (for example, watering for 20 minutes three different times a week).
It may seem obvious, but keeping your lawn watered is critical for lush and green grass. You'll need to assure your lawn gets 1 inch of water per week. If it's not raining regularly, set up a sprinkler. Alternatively, make watering your yard part of your morning routine.
There is no way to revive dead grass, but you can lay new sod to grow your landscape again from scratch. If you notice brown, bare, or thinning areas in your lawn, these are clear signs that you need to sow new seed or replace the sod.
If your grass gets too much water, it doesn't get oxygen and can actually suffocate. Too much water also makes your grass more susceptible to disease.
Most grass needs watering between 20 to 40 minutes at a time. Water your grass one to three times a week in peak growing seasons. Your grass type, region, and amount of rainfall impact watering times. Watch out for signs of too much or too little watering to avoid disease or dead grass.
Water Wisely
Many of us water too often and too long. Most lawns need to be watered no more than three days a week in the spring as well as in the summer and two days a week in the fall. This watering schedule is recommended under normal water supply conditions.
Avoid watering grass on a hot afternoon when it's 95 degrees or higher. The best time to water grass is at dawn or in the early evening. Water deeply three times a week instead of a little water daily. Test whether your sprinkler system is watering your lawn evenly.
In the blazing summer, when temperatures are between 90-100+, try watering 3-4 times a week.
Grass blades turn brown as they lose available moisture. If the drought doesn't last beyond 3-4 weeks, most of these areas can re-grow new, green blades when wet conditions return. However, if lawns don't get 2″ of water weekly for 4 weeks consecutively, permanent damage can occur.
Typically, most lawn irrigation periods during the summer should last between 25–30 minutes each. This amount of time depends on a lot of different factors though. As previously stated, each irrigation system or sprinkler can deliver different amounts of water and it's important to hit that 1 inch per week requirement.
One of the most obvious signs your grass isn't getting enough water is dry soil. If you notice the top layer of soil in your yard is dry and crumbly, then it is time to give your lawn a good watering.
Red-orange colored grass is a sign that the lawn is stressed and overwatered. This discoloration is caused by the rust fungus. Anthracnose and brown spots are also common in wet grasses.
In general, lawns in summer need about ½” of water every 3 days or so. If it's a little cooler where you are, say, in the high 70s, then you could get away with ½” every 3-4 days. If it's hotter where you are, say, 85 and sun all day, then maybe every 2-3 days.
Many grasses can stay in dormancy for 3-4 weeks without beginning to deteriorate to the point of plant death. When the prolonged period without rain ends, the turf is able to regenerate from rhizomes and stolons.
A watering session should be long enough to soak the area sufficiently so all the roots receive a beneficial drink. Sprinklers should be set to run for about 30 to 35 minutes at a time twice a week. Your goal is at least 1″ of water a week for your lawn.
Warm-season grasses
Usually 1 or 2 times a week is sufficient. If you want to determine the maximum amount of time your sprinklers can be left on at one time, observe a cycle from the beginning to the time when runoff begins. That is the maximum amount of time that you let your sprinklers run in any given watering.
In times of extreme heat, it is vital to water your lawn for about 30 to 45 minutes daily. Once the temperatures drop below ninety, you can cut back to watering three to four times a week, until that blissful thunderstorm comes and quenches your lawn's thirst!
Yellow grass can be caused by overwatering or underwatering.
Homeowners may think that the more the lawn is watered, the better condition it will be in. Unfortunately, overwatering the yard can drown grass roots and lead to less oxygen in the soil, which is essential for healthy, green grass.
According to lawn care experts, the best time to water grass is in the early morning, ideally before 10am. During this time, the temperature outside is still relatively cool, and the wind and sun are less intense.