Why Is My Lawn Turning Brown?

Northern New Jersey lawns are cool-season turf—mostly tall fescue, Kentucky bluegrass and perennial ryegrass. During hot, dry stretches they slow down, wilt and can eventually go dormant.

Browning from heat and drought does not automatically mean the grass is dead. Established lawns most often need supplemental water in June, July and August, but how much depends on rainfall, soil, sun exposure and how your irrigation actually performs. There's no single watering schedule that fits every property.

Warm, humid periods—common across New Jersey summers—can favor several turf diseases. Depending on the disease and grass type, symptoms can show up as spots, irregular patches, rings, thinning or lesions on individual blades.

Drought, insects and cultural stress can all look like disease, so a pattern or photo alone isn't a reliable diagnosis.

• Brown patch — particularly relevant to tall fescue during hot, humid weather.
• Dollar spot — small straw-colored spots that can merge into larger areas when conditions favor the disease.
• Red thread — discolored patches, sometimes with visible reddish or pink fungal threads.

Not every brown patch needs a fungicide. Proper diagnosis comes first.

Insects can damage turf, but brown grass on its own doesn't prove an insect problem. White grubs feed on roots, which weakens the turf above them and can make it easier to pull up.

Before deciding insects are responsible, a professional looks at the turf and roots, whether pests are actually present and in what numbers, the time of year and the damage pattern. Finding a single grub doesn't mean treatment is needed.

Repeatedly cutting cool-season grass too low adds stress. For most New Jersey lawns, a mowing height of roughly 2½ to 3 inches is a good target; mowing below 2 inches reduces the turf's ability to handle heat and drought and can leave it more vulnerable to other problems.

We generally want homeowners to keep plenty of leaf on the plant rather than scalp the lawn—especially heading into summer.

The one-third rule: avoid removing more than about one-third of the grass blade in a single mowing.

A lawn can have an irrigation system and still suffer moisture stress. Common reasons include:

• Poor sprinkler coverage or overlap
• Blocked, broken or misaligned heads
• Zones that don't account for different sun exposure
• Slopes where water runs off
• Compacted soil or soil that doesn't accept or hold water well

Too much water causes its own problems—from shallow roots to conditions that favor disease. More water isn't automatically the answer.

Sometimes struggling turf is really a soil problem showing up in the grass. Compaction, poor drainage, shallow or disturbed soil, pH that's off, nutrient imbalances or a poor rooting environment can all keep grass from thriving.

This is especially common on new-construction and heavily disturbed properties. A soil test is often the clearest starting point, and properties built on disturbed soil may benefit from New Build Soil Regeneration.

Cool-season grass can lose color or go dormant during extended summer stress as a survival response. Brown doesn't necessarily mean dead.

Whether dormant turf recovers depends on the grass type, how severe and how long the stress lasts, and the site conditions—so recovery isn't guaranteed.