If your lawn suddenly develops brown patches, thinning grass, or areas that peel up like carpet, you may be dealing with lawn grubs. These underground pests can cause serious damage before you even realize they’re there.

In this guide, we’ll explain what lawn grubs are, how to identify them, and what to do if they’re damaging your yard—especially in climates like North Texas.

What Are Lawn Grubs?

Lawn grubs are the larval stage of certain beetles that live beneath the soil and feed on grass roots.

As explained by Ryno Lawn Care:

“These cream-colored C-shaped creatures are the larvae of various beetle species, including Japanese beetles, masked chafers, and June bugs. They feed on grass roots, causing the grass to die and leading to visible turf damage.”

Because they attack the root system, grubs will quickly turn a healthy lawn into a patchy, weakened landscape. Read Ryno’s full article about how to control grub worms in lawn.

What Do Lawn Grubs Look Like?

Grubs are fairly easy to identify once you know what to look for:

• Cream or white-colored bodies
• C-shaped when at rest
• Brown heads with small legs near the front
• Typically found just below the soil surface

They usually appear in late spring through early fall, depending on the beetle lifecycle.

Signs You Have Lawn Grubs

Grub damage often looks similar to drought stress, but there are key differences.

Common warning signs:

• Brown or dead patches of grass
• Grass that pulls up easily (like loose sod)
• Increased activity from birds or animals digging in your yard
• Spongy or soft turf when walking

👉 If your grass lifts easily, it’s a strong sign the roots have been eaten.

Lawn Grubs vs. Healthy Lawn

Why Lawn Grubs Are a Problem

Grubs don’t just damage your lawn—they weaken it long-term.

Real-world impact:

• Destroy grass roots, preventing water and nutrient absorption
• Create conditions for weeds to take over
• Attract animals like raccoons and birds that tear up your yard
• Lead to costly lawn repairs or even full replacement

In North Texas, where heat already stresses lawns, grub damage can accelerate lawn decline quickly.

When Are Grubs Most Active?

Grubs are most active during:

• Late summer to early fall (peak feeding time)
• Spring (as they begin feeding again before maturing)

This makes preventative lawn care especially important before peak seasons.

How to Check for Grubs

You can confirm a grub problem with a simple test:

1. Cut a small square of grass (about 1 foot by 1 foot)
2. Lift it gently
3. Look for grubs in the top 2–3 inches of soil

👉 Finding 5–10 grubs per square foot usually indicates a problem.

How to Prevent Lawn Grubs

Prevention is key to protecting your lawn.

Tips:

• Maintain a healthy lawn with proper watering and fertilization
• Schedule preventative lawn treatments
• Avoid overwatering, which can attract beetles
• Monitor your lawn during peak seasons

When to Call a Professional

DIY treatments can help, but severe infestations often require professional care.

Call a lawn care expert if:

• Damage is widespread
• Grubs keep coming back each season
• Your lawn is thinning despite proper care

Professional services can:

• Accurately diagnose the problem
• Apply targeted treatments
• Prevent future infestations