Moles in Your Yard? Here's What's Really Going On

If you have spotted raised ridges snaking across your lawn or cone-shaped dirt piles popping up overnight, you are not alone. Mole activity picks up across Fort Wayne and Marion every spring, and it is one of the most common complaints we hear from homeowners. But before you start dumping grub killer on your lawn, there are a few things you should know. The story underground is more complicated than most people think.

What You Are Actually Looking At

Those raised ridges running through your grass are surface feeding tunnels. The eastern mole (Scalopus aquaticus) — the species responsible for most lawn damage in Indiana — pushes through the soil just below the surface, hunting for food.

Michigan State Extension describes two types of mole tunnels. The first are straight or gently curved runs that act like highways between feeding areas. Moles use these for months or even years. The second type are winding, serpentine tunnels where the mole is actively searching for food. These branch off the main runs and cover more ground.

The cone-shaped mounds of dirt — molehills — come from deeper digging. When a mole excavates a tunnel 10 inches or more below the surface, it pushes the excavated soil straight up to create those volcano-shaped piles. These deeper tunnels are more permanent and get used year after year.

Here is the part that surprises most people: you probably only have one or two moles causing all that damage. Purdue Extension notes in their wildlife damage publication (ADM-10) that moles are solitary animals. A typical residential yard rarely has more than two or three at any given time. They just cover a lot of ground.

The Biggest Myth About Moles

We need to be honest with you, because there is a lot of bad information out there about moles.

The most common thing homeowners tell us is: "I need to kill the grubs so the moles will leave." It sounds logical. Moles eat grubs, so kill the grubs, remove the food source, and the moles move on. Simple, right?

Not exactly.

Purdue Extension makes it clear in ADM-10: grubs make up only a small portion of what moles eat, and moles are often present in grub-free lawns. Iowa State Extension is even more direct — they call this one of the most persistent and harmful misconceptions in lawn care.

What Moles Really Eat

According to Michigan State Extension, roughly 80 percent of a mole's diet is earthworms. The rest includes beetle larvae (grubs), centipedes, millipedes, spiders, and other soil-dwelling invertebrates. Earthworms are the main course. Grubs are a side dish.

This is why treating your lawn for grubs will not solve a mole problem. Modern grub insecticides have no effect on earthworms — and earthworms are the primary reason moles are in your yard. Iowa State Extension puts it plainly: since white grub insecticides do not reduce the mole's main food supply, applying them will not accomplish the goal of managing the mole.

We could sell you a grub treatment and tell you it will fix your mole problem. But that is not how it works, and we would rather be straight with you.

Why Your Yard Attracts Moles

Moles prefer loose, moist soil that is full of earthworms and insects. In other words, they prefer healthy soil. That is the frustrating part — a well-maintained lawn with good soil biology is exactly the kind of yard moles want to live in.

Spring is peak mole season across northeast Indiana because the conditions are perfect. The soil is moist from snowmelt and spring rains, and earthworm activity is at its highest near the surface. Purdue Extension notes that moles are active year-round, but their surface tunneling is most visible when soil moisture is high and temperatures are moderate — exactly what we see in April and May across Fort Wayne and Marion.

Irrigated lawns tend to see more activity for the same reason. Consistent moisture keeps earthworms near the surface, and the moles follow.

So What About the Grubs?

Here is where the story takes an important turn. While moles are not in your yard because of grubs, grubs might still be in your yard — and that is a much bigger problem for your lawn.

Mole tunnels cause cosmetic damage. The grass is not dead; it is just pushed up. In most cases, you can step on surface ridges to flatten them, and the grass recovers on its own. Molehills are messy, but the turf underneath is fine.

Grub damage is different. As we covered in our post on grubs, white grubs feed on grass roots and sever the connection between the plant and the soil. When grub populations are high enough, the grass dies — and dead grass does not come back on its own. Those brown patches that feel spongy underfoot, where you can peel back the turf like a loose carpet? That is grub damage, and it requires real intervention.

If you are seeing mole activity AND areas of dead, spongy turf, you may have both problems at once. The moles are chasing earthworms. The grubs are quietly destroying your lawn's root system underneath. That is when calling us makes the most sense — because the grub problem is the one that actually threatens your lawn's health.

Why DIY Mole Remedies Rarely Work

You have probably seen the products: castor oil sprays, ultrasonic vibration stakes, chewing gum, mothballs, pinwheels. Homeowners try everything.

Purdue Extension and Michigan State Extension both note that most commercial mole repellents show inconsistent results in research trials. Some castor oil products may provide temporary relief in small areas, but moles typically just move to untreated parts of the yard. Ultrasonic devices, vibration stakes, and home remedies have no scientific support.

The methods that have actually been shown to work — trapping and specialized baits — both require proper technique, the right equipment, and knowledge of mole behavior. Which tunnels are active, how to avoid spooking the mole into abandoning a run, where to place traps — these details matter. It is the kind of work where experience makes a real difference, and a licensed wildlife control operator is your best bet if the damage is severe enough to warrant action.

What We Tell Our Customers

When homeowners call us about moles, here is what we tell them.

The mole damage itself is usually cosmetic. Flatten the ridges, rake out the molehills, and your grass will recover. A thick, healthy lawn bounces back from mole tunneling faster than a thin one — which is another reason a proper fertilization program pays off.

Do not waste money on grub treatments as a mole solution. If we are treating your lawn for grubs, it is because grubs are a threat to your turf — not because we think it will chase moles away.

If mole activity is severe, that is a job for a wildlife control specialist. Professional trappers who know mole behavior get results that store-bought products simply do not.

Make sure the real damage is not coming from grubs. If your lawn has areas that look dead and feel spongy, that is not the moles. That is a grub problem, and that IS something we handle. Our preventive grub control targets the narrow window when larvae are most vulnerable, and it protects your lawn's root system through the entire season.

The bottom line: moles are annoying, but they are not destroying your lawn. Grubs are. If you are not sure which problem you are dealing with, give us a call at our Fort Wayne or Marion office. We will help you figure out what is actually going on underground — and what, if anything, needs to be done about it.