What Are the Signs of Grubs in a Lawn?

Grubs can kill an entire lawn or parts of the lawn in one summer. Look for signs of grubs before you decide to treat the lawn for grub infestation. You will need a few days to properly investigate whether or not grubs are killing your lawn.

Brown Grass

If the grass is browning even when you keep watering, you may have a grub infestation. The grubs can affect the entire yard, or they may cause brown patches to form. The wilting and browning grass can occur in irregular shapes. Pull back the sod to check for white grubs, which are c-shaped, white and resemble plump worms.

Skunks, Moles or Raccoons

Grubs in the soil will attract skunks and raccoons at night. The animals will dig holes in the lawn to find the grubs and eat them. Check for grubs in any area of the lawn that contains numerous holes.


If you notice that sparrows or other birds such as the starlings are pecking at the brown spots in the lawn, the birds may be looking for grubs. Crows do not usually dig for grubs, but some robins will if the grubs are closer to the top of the soil.


A large amount of beetles in your yard in May and June could signify a grub infestation or lead to a potential infestation next year. The Japanese beetle, also known as the June beetle, lays its eggs in the lawn. The eggs develop into grubs. During May or June, the larvae enter the final pupae stage and emerge as full-grown beetles.

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