Summer Watering 101
How Long Should You Water Your Lawn?
It's one of the most common lawn care questions we hear: how long should I water my lawn? The honest answer is that it depends on your grass type, soil, irrigation system, and the time of year — but there are clear guidelines that apply to most lawns across Georgia, Tennessee, South Carolina, and Alabama. Turf Masters has helped thousands of homeowners dial in their watering habits, and this guide covers everything you need to know.
The Goal: One Inch of Water Per Week
For most lawns in the Southeast, the target is one inch of water per week during the active growing season — either from rainfall, irrigation, or a combination of both. During the hottest stretches of summer, warm-season grasses like Bermuda and Zoysia may need up to two inches per week to maintain active growth and prevent stress. Cool-season fescue lawns need consistent moisture, especially in summer when heat stress is highest.
How to Measure an Inch of Water
Before you can set a watering time, you need to know how fast your irrigation system delivers water. The tuna can method is the simplest approach: place an empty tuna can in each irrigation zone while it runs. Time how long it takes to fill the can — that's how long you need to run that zone to apply one inch. Sprinkler systems vary widely in output, so this test zone-by-zone is the only accurate way to know your actual delivery rate. Most systems need anywhere from 20 minutes to over an hour per zone to deliver one inch.
How Long to Water by Grass Type
Grass type significantly affects watering needs:
- Bermuda grass — 1 inch per week during active growth; up to 2 inches during extreme summer heat; deep infrequent watering promotes the deep root system Bermuda needs to handle drought
- Zoysia grass — 1 inch per week; more drought-tolerant than fescue but still benefits from consistent moisture during July and August; avoid overwatering, which increases disease pressure
- Tall fescue — 1 to 1.5 inches per week; the most water-sensitive of the three during summer; deep infrequent watering (one long session rather than multiple short ones) encourages the deep roots fescue needs to survive Southeast summers
How Often Should You Water?
Frequency matters as much as total volume. Deep and infrequent is the correct approach for all grass types — watering two to three times per week in longer sessions produces healthier, deeper root systems than daily light watering. Daily shallow watering encourages roots to stay near the surface, where they are more vulnerable to heat, drought, and disease. A lawn watered twice a week deeply will almost always outperform one watered lightly every day.
Best Time of Day to Water
Early morning is the optimal watering window — ideally between 4 a.m. and 9 a.m. Watering in the morning allows the grass blades and soil surface to dry during the day, reducing fungal disease pressure. If morning watering isn't possible, late afternoon (between 4 p.m. and 6 p.m.) is a reasonable secondary option. Avoid watering after 6 p.m. — grass that stays wet overnight in the warm, humid Southeast is significantly more vulnerable to brown patch, dollar spot, and other fungal diseases.
If you are not sure your lawn is getting enough water, there are a few easy ways to check. The simplest way is the screwdriver test. After your lawn is watered, take a long-blade screwdriver and stick it straight down into the soil. If your lawn is properly watered, the blade should puncture all the way down (at least 3 inches for clay soil) into the soil. If the screwdriver has trouble going in and the soil is hard and dry, your lawn is most likely not receiving enough water.
Overwatering and underwatering
Did you know that overwatering can cause more damage to your lawn than underwatering? Watering your lawn every day or even every other day can ruin your turf as the result of overwatering. The soil underneath your grass contains porous spaces containing oxygen vital to plant growth. Daily watering will push the air out of those spaces, filling the pores with water. This can cause the roots to suffocate and die. And this can result in a shallow root system and more susceptibility to weeds, disease and insect damage.
Signs You're Watering Too Much
● Development of thatch—A layer of decomposed plant material that builds up when overwatering prevents beneficial soil bacteria.
● Fungus—Thin or weak grass that has a reddish-orange color could be a sign of fungus from overwatering.
● Weeds—Overwatered lawns will develop weeds that are harder to control such as nutsedge and crabgrass.
● Insects—Too much water creates a conducive habitat for pests. Damage from armyworms, cutworms or other insects could be the result of overwatering.
On the other hand, if your lawn is being underwatered, it can experience drought damage, weeds and other symptoms.
Signs You're Watering Too Little
● Dry patches—If you notice your lawn has developed patchy areas of straw colored grass, this could be a result of too little water.
● Visible footprints on grass—If your turf is not springing back up when you step on it, this could be a sign that the grass blades are dehydrated.
● Slowed growth—If you notice you are not having to mow as often, your lawn's growth may be stunted as a result of too little water.
Though dry turf is never ideal, it is not the end of the world. Warm-season grasses such as Bermuda or Zoysia can bounce back from dehydration with attentive watering, fertilizer and aeration.
To help prevent drought damage in cool-season grasses like Fescue, a professional core aeration and seeding treatment every fall is imperative.
Let Turf Masters Take the Guesswork Out
Proper watering is the foundation of everything else in your lawn care program. Turf Masters serves homeowners across Georgia, Tennessee, South Carolina, and Alabama with full lawn care programs that account for your specific grass type, soil, and seasonal conditions. Contact Turf Masters today, and let's make sure your lawn is getting exactly what it needs.
Photo credit: K Rain
