By Kyle Caldwell, Owner & Agronomist, Century Outdoor Services | Austin, TX
Every July, August, and September, I can almost predict when our phones are going to start ringing. We finally get one of those much-needed summer rainstorms, and within a day or two homeowners across Austin begin noticing brown spots all over their lawns. The calls usually start the same way:
“My lawn looked fine before the rain, but now I have brown patches everywhere. Do I have a fungus?”
Most of the time, the answer is no.
In fact, one of the biggest misconceptions I see during a Central Texas summer is that rain somehow causes these brown spots to appear. The truth is that the rain isn’t creating the problem—it is simply making an existing issue much easier to see.
At Century Outdoor Services, we inspect hundreds of lawns every year, and this is one of the most common situations we run into after a summer rain. Understanding what’s happening can save you from spending money on products your lawn doesn’t need.
If you’ve lived in the Austin area for very long, you know how our summers work. We go weeks without meaningful rainfall while temperatures climb well into the upper 90s and triple digits. On top of that, most homeowners are limited by watering restrictions, which means our lawns are constantly trying to survive on less water than they would really like.
As the summer wears on, certain areas of the yard naturally become stressed. These are what we refer to as hot spots. They may be located where the afternoon sun beats down the hardest, where the soil is shallow, or where irrigation coverage isn’t quite as good as the rest of the lawn.
Before the rain, these areas may already have looked a little faded or off-color. They simply didn’t stand out because the entire lawn was under some level of heat stress.
Then the rain arrives.
Almost overnight, the healthy grass responds by turning a beautiful deep green. Bermuda and Zoysia are especially quick to take advantage of fresh moisture. The stressed areas, however, can’t recover nearly as fast because they’ve already been through weeks of heat and drought stress.
Suddenly those dry spots seem to appear out of nowhere.
They were actually there all along.
I see this most often in Bermuda and Zoysia lawns throughout Central Texas. Both grasses are incredibly drought tolerant, but that doesn’t mean they stay green forever without moisture.
One of the reasons these grasses perform so well in Texas is because they’re smart plants. When conditions become too stressful, they’ll slow their growth and even go partially dormant to protect themselves until moisture returns.
Many homeowners mistake that dormancy for dead grass.
Fortunately, those are two very different things.
Most of the time, the brown leaf tissue you’re seeing is simply the top growth that dried out during the hottest part of the summer. The crown of the plant—the growing point—is still alive beneath the surface. Once cooler temperatures arrive or soil moisture improves, the grass begins producing new growth again.
That’s why I always tell customers not to panic when they see these spots after a rainstorm.
One thing I encourage homeowners to avoid is assuming every brown patch is a lawn disease.
After a rainstorm, it’s easy to convince yourself that fungus has suddenly taken over the yard. While lawn diseases certainly exist in Central Texas, they’re much less common than simple drought stress.
Before treating anything, I always ask homeowners one simple question:
Did those areas already look stressed before the rain?
If the answer is yes, you’re probably looking at hot spots—not a disease.
The rain simply made the healthy grass recover faster, which created a much greater contrast between the healthy turf and the stressed turf.
That difference in color is what catches your eye.
This is where I see homeowners waste the most money.
As soon as brown spots appear, many people head to the store looking for a fungicide. Unfortunately, if the problem isn’t actually a disease, that application isn’t helping anything.
In fact, it can actually work against you.
I like comparing fungicides to antibiotics. When we take antibiotics, they don’t only eliminate harmful bacteria. They also affect many of the beneficial bacteria our bodies need.
The same thing happens in your lawn.
Healthy soil is full of beneficial fungi, bacteria, and microorganisms that help break down organic matter, cycle nutrients, and support healthy root development. When fungicides are applied unnecessarily, they don’t distinguish between the organisms we want and the ones we don’t.
That’s why at Century Outdoor Services we only recommend fungicide applications when we’re confident a disease is actually present.
Instead of looking at these spots as a problem, I like to think of them as valuable information.
Your lawn is showing you exactly where it’s struggling.
Maybe that section isn’t getting enough irrigation.
Maybe the soil is only a couple of inches deep.
Maybe the afternoon sun reflects off the driveway and heats that area much more than the rest of the yard.
Every hot spot has a reason.
Rather than trying to cover it up with chemicals, it’s much more valuable to figure out why that area consistently dries out faster than everything else.
One thing I remind homeowners every summer is that we live in Central Texas.
Between the heat, the drought, and watering restrictions, there are times when our lawns simply can’t stay perfectly green every day of the summer.
That’s normal.
Warm-season grasses evolved to survive these conditions. They’re designed to protect themselves until moisture returns.
Sometimes the best thing you can do is simply be patient.
As temperatures cool and rainfall becomes more consistent in late summer and fall, these stressed areas often recover remarkably well without any special treatment.
If you notice brown spots appearing after a summer rain, don’t assume the worst.
Take a walk through your yard and think back to what those areas looked like before the storm. Were they already a little lighter in color? Did they seem to dry out faster than the rest of the lawn? Are they in full afternoon sun?
If so, there’s a very good chance you’re simply looking at drought-stressed hot spots that are taking longer to recover than the rest of your lawn.
At Century Outdoor Services, we see this every single summer, and more often than not, the solution isn’t another product—it’s understanding how warm-season grasses respond to the challenging conditions we face here in Central Texas.
If you’re ever unsure whether you’re dealing with drought stress, insects, or a disease, we’re always happy to take a look and help you determine what’s really going on. Sometimes the best recommendation we can make is simply giving your lawn a little more time.
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