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.
As a general rule, it is ideal to water a lawn in hot weather infrequently, yet thoroughly, instead of lightly misting in various times of the day. You must water your lawn in hot weather at least three times per week, as long as you soak the soil to a depth of at least six to eight inches.
Water early in the morning to reduce disease risk and allow absorption before heat. For most grasses, 1-2 weekly waterings of 25-30 minutes should provide the needed 1 inch, adjusting based on your system and soil type. Signs of underwatering include thinning, yellowing,or browning grass.
The ideal watering schedule is once or twice per week, for about 25 to 30 minutes each time. Taking care of a lawn doesn't have to be an overwhelming, all-consuming task.
1-2-3-2-1 watering technique:
In April water 1 day/week. In May ramp up to 2 times/week. In the heat of the summer water 3 times/week. In September drop back to 2 times/week. In the fall drop back down to 1/week.
If you're not sure how much time it takes for your sprinklers to spray an inch of water, you're not alone. A fixed spray head nozzle might take ~30 minutes to apply 1 inch of water, whereas a rotary nozzle could take 3x as long to apply the same amount.
Plants in containers and hanging baskets may need water twice a day - especially when weather is windy and hot, containers dry out very quickly. Check often, as most will need water at least once a day, and some may need water in the morning and the evening.
With a hose, water goes exactly where you want it to go, as opposed to sprinklers that just spray water all over the place with much of the spray lost to wind or evaporation before it can percolate down into the soil.
Watering like this too frequently for less time doesn't wet the ground enough and keeps roots too close to the surface. Less frequent, longer, and deeper watering encourages roots to reach down for water. A root system extending far down is less susceptible to heat stress and pest damage.
Water Wisely
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.
Without water, the grass eventually goes dormant, turning brown and staying that way until revived with adequate moisture. In general, grass can go up to six weeks without water, depending on the condition of the lawn, soil and other environmental factors.
Water in the early morning (4am to 10am). This allows the grass blades to dry, making them less susceptible to foliar diseases. Watering is more efficient in morning due to less evaporation and wind speed. Change the time that your system runs monthly, or at least seasonally.
With new grass seed, maintaining consistent soil moisture is key. Professionals know how to avoid waterlogging while keeping the soil hydrated. They will water 2-3 times daily in short intervals to prevent oversaturation, ensuring about 3-4 inches of water per week.
Each week, give turf one or 1 ½ inches of water, as early in the day as you can. Watering in the morning gives the soil enough time to soak the liquid before the heat of the day evaporates it. Plus, if you were to water in the evening, it could actually make any fungal diseases worse!
Why is my grass yellow? Yellow grass is a sign of low nutrition and can be caused by too little water, too much water, blunt cutting blades on your mower, or lawn diseases. Water your lawn if it's too dry and aerate your soil if puddles are collecting. Sharpen your cutting blades on your mower for a cleaner cut.
If your grass is actually dead, there's nothing you can do to bring it back other than plant new grass. Brown grass, however, can green up following proper care. Oftentimes, that just means water, nutrients, and cooler temperatures for northern lawns and warmer temperatures for southern lawns.
For example, rotor sprinkler heads might require 20 to 30 minutes of straight watering time, while a traditional spray head zone will only need 5 to 10 minutes.
Your goal is for the lawn to receive enough water to keep the soil slightly moist in the upper six inches of soil. This usually requires at least one inch of water per watering session or around 30 minutes of watering, however, each lawn is different.
Water deeply.
Giving your lawn a big gulp of water is better than giving it a series of sips. Roots grow where the water is. If you water deeply, you will develop a deep root system. On the other hand, if you only sprinkle the surface of the soil, you will create a shallow root system.
Drip systems are designed for years of use, whereas soaker hoses often require frequent replacements. This durability reduces waste and means a smaller environmental footprint, as it minimizes the need for repeated manufacturing and disposal compared to soaker hoses.
6. Lawn Sprinkler and Irrigation Systems. If you have a lawn sprinkler and irrigation system, you should know that it's naturally going to work harder during the warm summer months. If your irrigation system isn't programmed correctly or it develops a leak, you might find your water bill creeping higher than usual.
WATERING SCHEDULE
Deep watering helps to encourage deep root growth. Deeper roots stay cooler and stronger to better protect your lawn and garden from heat stress. Allow a deep watering at least once per week, twice if the temperature exceeds 100 degrees or more for several days in a row.
Deep watering entails watering at a slow pace for long enough that the water soaks deep into the soil, where the roots are. Often this means watering for 30-60 minutes at a time, 2-3 times each week, until plants are established.
What time of day should you water your lawn during extreme sun and heat? “Irrigate early in the morning whenever possible,” Goatley said. “Irrigating during the heat of the day is considered to be very inefficient as evaporation rates are typically highest during this time of day.