How to Fix Brown Patches in Your Lawn
Quick Answer
First identify the cause — fungal disease, grub damage, and drought stress all produce brown patches but need different fixes. Ring-shaped patches appearing in humid weather usually point to fungus; irregular patches with loose, root-free turf point to grubs; uniform browning following dry spells points to drought stress.
Diagnose the Cause First
Treating the wrong cause is the most common mistake homeowners make with brown patches — applying fungicide to grub damage (or vice versa) wastes time while the lawn keeps declining. Use this quick triage before doing anything else:
- Ring or halo shape, humid weather: likely fungal disease
- Irregular shape, turf lifts like loose carpet: likely grub damage
- Uniform browning after dry weather, footprints don't spring back: likely drought stress
If It's Fungal Disease
Common turf fungus (brown patch, dollar spot, rust) thrives in warm, humid conditions, especially when grass blades stay wet for long periods — often from evening watering or poor airflow. See our full lawn fungus identification guide for visual differences between disease types.
Fix the moisture pattern first
If It's Grub Damage
Grubs (beetle larvae) feed on grass roots just below the surface. Damaged turf pulls up easily with little resistance because the root system is gone. If you find several C-shaped white larvae per square foot when you lift the turf, grubs are the cause — see our grub identification and treatment guide.
If It's Drought Stress
Grass under drought stress often shows a simple diagnostic sign: step on it, and if your footprint doesn't spring back within a few minutes, the blades are dehydrated. This pattern usually resolves once consistent deep watering resumes, as long as the crown of the plant survived.
Repairing the Patch Once the Cause Is Fixed
- Remove any dead grass and loosen the top inch of soil
- Overseed with grass seed matched to your existing lawn — see our overseeding guide
- Keep the area consistently moist (not soaked) until germination
- Hold off mowing until new grass reaches normal mowing height