If your Polk City lawn has developed raised ridges pushing up through the grass, soft spongy spots underfoot, and distinctive volcano-shaped mounds of pushed-up soil, you have moles. These underground mammals are common across central Iowa — and they can transform a well-maintained lawn into a rutted, uneven mess in a matter of days. A single mole can excavate up to 100 feet of new tunnels per day. They don’t stop when you ignore them; they just keep digging.

One important thing to understand about moles: they don’t eat your plants. Moles are insectivores — they feed almost exclusively on earthworms, grubs, and other soil invertebrates. The damage they cause is purely structural. Tunneling severs grass roots and disrupts soil contact, killing turf along runway paths. Mounds and tunnels create uneven surfaces that are hazardous to walk on and difficult to mow. And mole activity is relentless — they’re active year-round, though surface evidence is most pronounced in spring and fall when moist soil makes digging easy.

Miller Pest Solutions has been solving mole problems in central Iowa since 2001. We use professional trapping and baiting methods that produce real results — not the repellents and home remedies that simply don’t work.

Signs of a Mole Infestation

  • Raised surface tunnels (runways) — the most visible sign of mole activity. These are ridges of pushed-up soil running across the lawn in irregular, winding patterns, typically an inch or two above the surrounding lawn surface. They follow no particular logic — moles dig where earthworms are, which varies with soil moisture and depth.
  • Volcano-shaped soil mounds — distinct from gopher mounds (which are fan-shaped and pushed to one side), mole mounds are roughly symmetrical piles with a plug near the center. They’re the exit points for deeper tunnels below.
  • Soft, spongy ground when walking across the lawn — shallow tunnels compress underfoot, creating an uneven, unstable surface. In spring, these can be trip hazards on otherwise flat lawns.
  • Dead grass patches along tunnel routes — tunneling severs root systems and creates air pockets that dry out grass roots, resulting in brown patches and dying turf along the tunnel path
  • Rapid tunnel expansion after rain — moles are most active in spring and fall when soil moisture is ideal. After a good rain, new tunneling activity can appear overnight across areas of the lawn that appeared undisturbed the day before.

Why Moles Are Common in Polk City

Polk City is a growing community north of Des Moines near Saylorville Lake in Polk County. Central Iowa’s rich, loamy topsoil is precisely the habitat eastern moles thrive in — it’s easy to excavate, retains moisture well, and supports high earthworm populations year-round. Well-irrigated, fertilized suburban lawns with healthy soil actually attract more moles, because they support more earthworms than dry, compacted lawns. In other words, a healthy lawn is an attractive lawn from a mole’s perspective.

Polk City’s proximity to Saylorville Lake, the Des Moines River, and extensive green space means residents deal with above-average mosquito, tick, and pest pressure — especially in neighborhoods that back up to natural areas and shoreline vegetation. Mole activity is visible throughout the year in Iowa but peaks in spring (March–May) and again in fall (September–October) when soil temperatures and moisture are optimal for digging close to the surface. In summer heat, moles dig deeper to follow moisture and earthworms, making their tunnels less visible — but they’re still present and still causing damage underground.

One mole per yard is actually typical. Moles are solitary and territorial, meaning a lawn with extensive tunnel systems usually has just one to three moles responsible for all of it. That’s both encouraging and important — professional control methods don’t need to address a large population, just the resident individual(s).

Our Mole Control Process

Miller Pest Solutions uses two proven professional methods:

  • Professional trapping — the gold standard for mole removal. We place professional-grade traps in active surface tunnels after confirming which runs are currently in use. Identifying primary travel tunnels versus short exploratory feeding runs is essential for placement accuracy. We check and service traps on scheduled follow-up visits.
  • Professional bait applications — mole-specific baits designed to mimic earthworms in size, shape, and feel are placed in active tunnel runs. Effective for properties where trapping access is difficult or as a complement to trapping in heavily active areas.

Castor oil repellents, vibration stakes, pinwheels, and ultrasonic devices have no consistent scientific support for mole control. Moles learn to ignore them quickly, or simply route their tunnels around them. Don’t waste time on these approaches — professional trapping and baiting are what actually work.

Why Choose Miller Pest Solutions

In business since 2001, QualityPro Certified, NPMA member. Joel Miller has been personally handling mole problems in central Iowa since 2007. We provide free phone bids so you know cost and approach before we come out. Honest service — if the activity pattern on your lawn suggests a single mole, we’ll tell you that and price the job accordingly.

Get a Free Phone Bid Today

Stop watching your lawn get torn apart one tunnel at a time. Call Miller Pest Solutions at (515) 329-8801 or visit millerthekiller.com for a free phone bid. We serve Polk City, IA and the greater Des Moines area.