
As the Texas summer heat cracks up into the 90s and 100s, homeowners naturally want to protect their lawns. A very common piece of advice circulating in neighborhood forums and general gardening blogs is to "mow your lawn at the highest setting during summer to shade the roots and retain moisture."
If you have a Fescue or Bluegrass lawn up North, that is excellent advice. But if you have a Bermuda lawn in North Texas, following this advice is one of the fastest ways to ruin your turf.
At the same time, trying to mimic a golf course putting green by dropping your mower deck to 1 inch usually backfires for the average residential property. Let’s break down the science of Bermuda grass, why the "mow high" myth fails, and why a 2.5-inch mowing height is actually the magic number for most McKinney, Frisco, Allen, and Plano lawns.
Bermuda grass is a warm-season turfgrass that thrives on intense sunlight. Unlike cool-season grasses that grow vertically and bunch up, Bermuda spreads horizontally through a dense network of runners called stolons and rhizomes. It loves the heat, but it has a strict requirement: it needs direct sunlight penetrating all the way down to its crown to stay thick and green.
When you let your Bermuda grass grow out to 3.5 or 4 inches (the highest setting on most residential mowers), a few negative changes happen rapidly:
On the flip side, turf textbooks and golf course superintendents will tell you that Bermuda loves to be cut short—ideally around 1 to 1.5 inches. Mechanically, this is true. Low mowing keeps the grass tight, dense, and incredibly green because the plant responds by pushing out more horizontal runners.
However, what works on a perfectly leveled golf course fairway rarely works on a residential lot in North Texas for one primary reason: the ground surface.
Most residential lawns across Collin and Denton counties have uneven ground. Between settlement over time, drainage swales, tire ruts from heavy equipment, and natural soil shifting from our heavy black clay, your yard is full of subtle bumps and dips.
If you drop a standard rotary mower down to 1 or 1.5 inches on an uneven lawn, the wheels will drop into a small dip, and the blade will completely scalp the high spots right down to the dirt. Unless you have professionally top-dressed your yard with sand to make it perfectly flat and are using a specialized reel mower, attempting a 1-inch cut will leave your yard looking patchy and chopped up.
To balance the biological needs of Bermuda grass with the physical realities of a typical residential yard, the ideal compromise for the peak summer growing season is 2.5 inches.
Here is why 2.5 inches works perfectly:
To maximize the health and appearance of your Bermuda lawn this summer, keep these additional practices in mind alongside your 2.5-inch height target:
Adjusting your summer mowing strategy to accommodate the unique growth habits of warm-season turf will keep your lawn dense, vibrant, and resilient all summer long.