The Best Time to Water Your Grass for a Lush Lawn and Reduced Water Waste

In many residential neighborhoods, sprinklers are often seen running from early morning until late evening. However, watering your lawn at the wrong time can harm its health and waste water due to evaporation or runoff.

So, when is the best time to water your grass? And how often should you water your lawn to keep it healthy, especially during the summer heat when your grass might be under stress? We consulted a lawn care expert for their top watering tips to keep your lawn in peak condition.

The Best Time to Water Your Grass

Teri Valenzuela, a natural science manager, recommends watering your lawn between 6 a.m. and 10 a.m. 'Watering during these hours helps the grass absorb water efficiently, prevents heat stress in high temperatures, and helps prevent lawn diseases,' says Valenzuela.

If you're not a morning person, there's another good time late in the evening. 'If your goal is to conserve water, try watering your lawn between 10 p.m. and 6 a.m.,' Valenzuela advises. 'This time frame is optimal because it minimizes water evaporation and often aligns with municipal watering restrictions.'

When Not to Water Your Grass

Mid-afternoon is the worst time to water your lawn, both for environmental reasons and for its health. (Though it might be the best time for kids who want to have fun with the sprinkler!)

'Watering during this time can put stress on your grass and limit its ability to absorb water,' Valenzuela explains. You could lose up to half of the water you apply due to evaporation, runoff, or the wind, and this loss occurs more frequently when watering during the hottest parts of the day. This can also increase the risk of lawn diseases and damage your grass.

Key Factors to Keep in Mind Before Watering Your Grass

There are numerous factors that influence the timing, method, and frequency of watering your grass. Gaining a better understanding of these factors can help you develop a consistent watering routine that promotes healthy, thriving grass and maintains its lush, green appearance.

Grass Type

Different types of grass have varying water needs, with some requiring more water than others. For instance, cool-season grasses generally demand more water than warm-season grasses.

Examples of cool-season grasses include:

• Kentucky Bluegrass
• Fescue
• Perennial Ryegrass
• Buffalo

Here are some examples of warm-season grasses:

• Bermuda Grass
• Zoysia Grass
• Centipede Grass
• St. Augustine Grass
• Seashore Paspalum Grass

Soil Characteristics

The type of soil significantly impacts how you care for your grass, as it determines factors like water retention and drainage efficiency. These factors affect how often and how deeply your grass needs watering. By understanding your soil's properties, you can establish a watering routine that supports a healthy lawn.

You might encounter different soil types, such as sandy, clay, loamy, or silty soils. Additionally, soil can be acidic or alkaline. To better understand your soil's type, pH, and nutrient levels, a soil test can provide useful insights.

Weather Conditions

The climate certainly affects when and how often your grass needs watering. If your area experiences frequent rainfall, the grass may require less watering. On the other hand, in a dry climate, more frequent watering will likely be necessary.

Weather factors also play a role in determining the best time to water your grass. During drier periods of the day, watering may be essential, but if the sun is too strong, it can lead to significant evaporation. Similarly, wind conditions can impact water absorption by your grass and are usually less intense during the morning hours.

The Optimal Approach to Watering Your Lawn

Getting the right water levels for your lawn is key to helping it flourish, while also conserving water. "Overwatering can cause fungus, disease, and soil compaction due to excess moisture from foot traffic," says Valenzuela. "On the other hand, underwatering leads to cracked, dry soil and wilting grass, which prevents water from reaching the root zone and hinders grass root growth." Try these strategies to help your lawn thrive this season.

Distribute Watering Sessions Evenly

Valenzuela advises against daily watering, as it can lead to shallow roots, making your lawn more vulnerable to stress if watering is interrupted by a drought. Instead, aim for one to two inches of water each week, divided into three sessions. And of course, if you receive a good rainstorm during the summer, reduce your weekly watering accordingly.

Nourish Your Lawn

Fertilizing your lawn before summer’s heat hits can help it thrive, even if you need to cut back on watering due to drought conditions. "Watering strategically in summer can be stressful for your lawn," says Valenzuela. "Preventative nutrients like Lawn Aid strengthen grass roots, enabling your lawn to better endure both heat and drought."

Invest in a Smart Irrigation System

To reduce the effort of watering, consider installing WaterSense-labeled irrigation systems. These systems can automatically adjust water usage based on local weather—watering less when it detects rainfall—or by monitoring moisture levels in your soil. This ensures the right amount of water for your lawn.

Prevent Water Waste

Adjust your sprinklers so that water is directed only to your lawn, avoiding sidewalks, driveways, and areas filled with weeds. Drip irrigation systems, hoses, and watering cans are effective for gardens and landscaping. If you’re okay with moving them around, these options help ensure water reaches the grass roots directly, reducing evaporation into the air.

Dethatching Your Lawn —removing dead grass, leaves, and debris (thatch)—can help prevent water waste. This layer of material that hasn’t decomposed may hinder the soil's ability to absorb water and essential nutrients.

Frequently Asked Questions

• Can watering dead grass bring it back to life?

  If your grass is dead, watering it won't revive it. You’ll need to reseed the lawn. However, if the grass is only dormant, it can be revived. You can identify dormancy if the grass is brown and dry but still has some green at the base. Grass goes dormant to protect itself in drier climates. With proper care (read: water), it can recover.

• How much water should you use to water the lawn?

  Overwatering and underwatering can both harm your lawn. Excessive water can lead to lawn diseases, while too little water can damage the grass. Most lawns need about one to one and a half inches of water per week. You can measure this by using a rain gauge or placing shallow containers, like tuna cans, in the lawn to track how long it takes for water to reach one inch of depth.

• What is the best way to water grass?

  The best watering method depends on the size of your lawn. Larger lawns may benefit from automated irrigation systems, which allow for less effort and more efficient watering. For smaller areas, however, using an irrigation system might waste water, so a hose might be a better option to water only the needed section of grass.