Your neighbor mows their lawn short and it looks like a golf course. You mow yours the same way and it turns brown, thin, and weedy within days. The difference usually comes down to one thing most people never think about: grass type and the cutting height that goes with it. On the Gulf Coast, we grow several different warm-season grasses, and each one has its own ideal mowing height. Cut St. Augustine as short as Bermuda and you will scalp it. Let Bermuda grow as tall as St. Augustine and it gets thatchy and weak.
Mowing height is one of the most important and most overlooked parts of lawn care. Get it right and your lawn grows thicker, fights off weeds, and handles our brutal summer heat. Get it wrong and you spend the season fighting brown patches and bare spots. At TurnKey Lawn Care, we mow every major Gulf Coast grass type across the New Orleans metro, so we set the deck height to match your specific lawn. This guide breaks down the proper mowing height for each grass and explains why it matters so much in our climate.
Why Mowing Height Matters More in Louisiana
In a cooler, milder climate, a slightly wrong cut height is forgiving. Here it is not. Our intense heat, strong sun, and high humidity put real pressure on a lawn, and cutting height is your first line of defense.
When you mow at the correct height, you leave enough leaf blade for the grass to feed itself through photosynthesis. Taller blades shade the soil, which keeps roots cooler and slows water loss during our hot, dry late-summer stretches. That shade also blocks sunlight from reaching weed seeds, so fewer weeds sprout. Deep, healthy roots follow, and deep roots are what carry a lawn through drought and heat.
Cut too short and the opposite happens. You expose the soil to direct sun, the lawn dries out fast, roots stay shallow, and weeds move in. In our high water table and clay soil, scalped spots can also stay soggy and invite disease. Correct mowing height works hand in hand with the right schedule, which we cover in our guide to lawn maintenance and mowing services. Together, height and frequency are the foundation of a healthy New Orleans lawn.
Mowing Heights by Grass Type
Most New Orleans lawns are one of four warm-season grasses. Here is the ideal mowing height for each, plus how to recognize it.
St. Augustine Grass
St. Augustine is the most common lawn grass in the New Orleans area, and for good reason. It loves our heat and humidity and tolerates some shade. It is also a grass that wants to be left fairly tall.
Ideal mowing height: 3.5 to 4 inches. Standard St. Augustine should be kept on the taller side. Dwarf varieties can go slightly lower, around 2.5 to 3 inches, but most local lawns are standard types. St. Augustine spreads by above-ground runners, and cutting it too short removes the growing points and exposes those runners to sun damage. Scalped St. Augustine is one of the most common lawn problems we see in the metro. For a deeper look, see our St. Augustine grass care guide.
Bermuda Grass
Bermuda is a tough, sun-loving grass often found on sports fields and sunny front yards. It tolerates a much shorter cut than St. Augustine and actually grows denser when kept lower.
Ideal mowing height: 1 to 2 inches. Bermuda thrives with frequent, low mowing, which encourages it to spread sideways into a tight carpet. Because it grows fast and aggressively in our heat, Bermuda lawns usually need the most frequent mowing of any local grass. Letting it get tall leads to heavy thatch and a puffy, uneven surface. Learn more in our Bermuda grass care and maintenance guide.
Zoysia Grass
Zoysia is a dense, slow-growing grass that creates a beautiful, cushioned lawn. It handles foot traffic well and chokes out weeds when healthy.
Ideal mowing height: 1 to 2.5 inches. Zoysia does best with a moderate to low cut. Because it grows slowly and densely, it can build thatch if left tall for too long, so steady mowing at the right height keeps it tidy. A sharp blade matters here, since Zoysia is tough and a dull blade tends to tear rather than cut it cleanly.
Centipede Grass
Centipede is a low-maintenance, light-green grass that prefers acidic soil and needs less feeding than other types. It is a good fit for homeowners who want a slower-growing lawn.
Ideal mowing height: 1.5 to 2 inches. Centipede should be kept fairly low and even. It grows slowly, so it usually needs less frequent mowing than St. Augustine or Bermuda, but keeping it at the right height prevents it from getting stemmy. Avoid cutting it too short, which can stress this sensitive grass.
The One-Third Rule Works With Height
Knowing your target height is only half the picture. You also need to know when to mow, and that comes down to the one-third rule. Never remove more than one-third of the grass blade in a single cut.
Here is how that ties height and frequency together. If your St. Augustine should sit at 3.5 inches, you mow when it reaches about 5 inches and bring it back down. If you wait until it is 7 inches tall, cutting back to 3.5 inches removes far more than a third, which shocks the lawn and turns it brown. The taller the target height, the more total growth the lawn puts on between mows, and the more often you may need to cut during peak season. We explain the timing side in our guide to how often to mow your lawn in New Orleans.
Signs Your Mowing Height Is Wrong
Your lawn shows clear signs when the deck is set wrong. Watch for these.
- Brown or white stubble right after mowing. This is scalping, the classic sign of cutting too short. You are removing leaf blade and exposing stems.
- A puffy, uneven, thatchy surface. Often a sign of cutting too tall for the grass type, especially with Bermuda and Zoysia.
- Bare or thinning patches. Repeated short cuts weaken roots and open gaps where soil shows through.
- More weeds than usual. Short mowing lets sunlight reach weed seeds. If weeds are spreading, our weed control for New Orleans lawns guide covers how mowing height supports weed prevention.
- Fast drying and heat stress. A lawn cut too short dries out quickly and yellows in the summer sun.
The Process We Use to Cut at the Right Height
Setting the correct height is a routine, repeatable process, and we follow the same steps on every lawn.
Step 1: Identify the grass type
Before we touch the mower, we identify what grass you have. St. Augustine, Bermuda, Zoysia, and Centipede each look different up close, and the type sets the target height.
Step 2: Set the deck height
We adjust the mower deck to the correct height for your grass and the season. We often raise the height slightly during the hottest part of summer to give the lawn extra shade and drought protection.
Step 3: Sharpen the blade
A sharp blade cuts cleanly. A dull blade tears and shreds the grass tips, which turns them brown and opens the door to disease. We keep blades sharp so every cut is clean.
Step 4: Mow at the right time
We mow when the grass reaches the trigger height under the one-third rule, not on a rigid date that ignores how the lawn is actually growing.
Step 5: Adjust for the season
As growth speeds up in spring or slows in fall, we adjust both height and frequency to match. The lawn tells us what it needs, and we respond.
Frequently Asked Questions
How short should I cut St. Augustine grass?
Keep standard St. Augustine at 3.5 to 4 inches. Cutting it shorter scalps the lawn and exposes the runners. See the details in how short you should cut St. Augustine grass.
What happens if you cut grass too short?
Cutting too short scalps the lawn, weakens roots, invites weeds, and dries out the soil in our heat. Learn the full effect in what happens if you cut grass too short.
Why is my grass turning brown after mowing?
Browning often means the deck was set too low or you removed too much at once. Read the causes in why your grass turns brown after mowing.
What is the best grass type for New Orleans?
St. Augustine is the most popular local choice, but the best fit depends on sun, traffic, and your goals. Compare options in the best grass type for New Orleans.
How do I keep my lawn green all summer?
Correct mowing height is a big part of it, along with watering and feeding. See our tips in how to keep your lawn green in summer.
Next Steps
The right mowing height is the difference between a lawn that struggles and one that thrives through a New Orleans summer. You do not have to memorize cut heights or guess at deck settings. TurnKey Lawn Care identifies your grass type, sets the right height, keeps our blades sharp, and adjusts for the season on every visit. We are your friendly neighborhood lawn care partner across the metro, with 5-star Google and Facebook ratings, modern equipment, and a satisfaction guarantee. Call us today at (504) 386-5468 for a free estimate and a custom plan built around your grass. No hidden charges, just dependable, reliable lawn care.