Holes & piles of dirt in Lawn

I have little piles of dirt all over my back lawn, looks like some kind of infestation or something. Would anyone know what is causing this? - Jan. 21/21 Thanks

Those little mounds could be earthworm castings. Earthworms are generally good to have in the lawn because they aerate the soil. But sometimes if you get too many, the mounds dry up when it gets warm and create a bumpy lawn.

I have the same thing. I ASSUMED it was earthworms and I was quite happy with that because we moved into this house a year and a half ago and the lawn/yard was a mess. So I have been working hard to amend the soil. Earthworms make me happy!..even with the little mounds of dirt.

Thanks for both of your replies. We’ll have an aerated lawn, and lots of earthworms to wiggle in the gardens.

This article may be of interest, at https://www.gardeningknowhow.com/lawn-care/lgen/worm-casting-mounds.htm . We have lots of piles in our lawn now, with all the rain.

Thanks Elizabeth, really do appreciate this useful information.