Every spring, when the snow melts across western Wisconsin and eastern Minnesota, our phones start ringing with the same question: “Something destroyed my lawn over the winter — what is it?”
Nine times out of ten, the answer is moles or voles. And despite the rhyming names, they’re completely different animals causing completely different damage — which matters, because the treatment that stops one does nothing about the other. After decades of treating lawns from Eau Claire to Woodbury, here’s how we identify each one in the field, and what we’ve found actually works.
The 30-second identification
Look at the damage, not the animal — you’ll almost never see either one.
Raised ridges and volcano-shaped dirt mounds = moles. Moles tunnel below the surface hunting insects, pushing soil up into ridges you can feel underfoot and mounding excess dirt into little volcanoes. There are no visible entry holes.
Surface trails of clipped, dead grass = voles. Voles carve shallow runways about two inches wide across the top of your lawn, often with golf-ball-sized holes where they enter their burrows. In spring, vole trails are frequently mistaken for erosion lines or lawn fungus — winding, snake-like paths of dead grass that appear as the snow melts.
If you remember one thing: moles mound, voles trail.
Moles: the insect hunters
That’s the key to controlling them: a mole problem is usually a food problem. Lawns with grub-heavy soil are mole magnets. In our service area, we consistently see mole activity spike in lawns that also test positive for grub infestations.
What we do about it: Our Mole Defense program uses pet-friendly baiting products — no traps to mow around, no worrying about your dog or kids finding hardware in the yard. We start with a bait program to knock down the current population, then shift to prevention. And because moles follow food, pairing mole control with [LINK: grub control] addresses the reason they moved in — treat the grubs and you’ve made your lawn a much less interesting place to hunt.
What we don’t recommend: castor-oil repellents and home remedies. University extension testing consistently finds their effect temporary at best, and homeowners burn a season re-applying them while the tunnels multiply. Trapping works in skilled hands but is slow, single-animal work — and most people give up before the lawn does.
Voles: the root eaters
Voles are small rodents — think of a stockier field mouse with a short tail. Unlike moles, voles are vegetarians, and unfortunately their favorite food is exactly what you’ve worked hardest to grow: grass roots, crowns, bulbs, and the bark of young trees and shrubs.
Wisconsin and Minnesota winters are what make voles such a problem here. Voles stay active all winter, tunneling under the snowpack where predators can’t reach them, eating grass down to the roots the entire time. That’s why vole damage seems to appear overnight in March and April — it’s been happening since December; the snow was just hiding it.
Voles also reproduce fast — multiple litters per year — which means a light infestation this fall is a heavy one next spring. And because vole populations move across property lines, treating one lawn in a neighborhood full of voles is a holding action.
What we do about it: Our Vole Defense program runs on a monthly basis, because consistent, long-term pressure is the only thing that keeps a reproducing vole population from bouncing back. And because neighborhood-scale treatment works dramatically better than single-lawn treatment, Green Oasis takes $25 off your service for every neighbor you refer who starts a treatment plan — call 715-832-0800 with your referral details. Getting two or three adjacent properties on a plan is genuinely the difference-maker for vole control, and we built the discount to make that happen.
What helps on your end: keep grass mowed into the fall, clear leaf piles and heavy mulch away from the lawn edge, and don’t let spilled birdseed accumulate — voles treat a feeder like a buffet. Young trees can be protected with trunk guards before snowfall.
Mole or vole? A quick reference
| Mole | Vole | |
|---|---|---|
| What it eats | Grubs, worms, insects | Grass roots, bulbs, bark |
| Damage looks like | Raised ridges, dirt mounds | Surface trails of dead grass, small open holes |
| When you notice it | Spring through fall, after rain | Early spring, as snow melts |
| Why it’s there | Grub-rich soil | Healthy roots + winter snow cover |
| What works | Baiting + grub control | Consistent monthly control, neighborhood-wide |
FAQs
Q: How do I know if I have moles or voles in my lawn? A: Look at the damage. Moles leave raised tunnel ridges and volcano-shaped mounds of dirt with no visible holes. Voles leave shallow surface trails of dead, clipped grass about two inches wide, with small open entry holes. Mole damage appears through the growing season; vole damage most often appears in early spring as the snow melts.
Q: Why does vole damage show up in spring in Wisconsin and Minnesota? A: Voles stay active all winter, tunneling beneath the snowpack where predators can’t reach them and feeding on grass roots the whole time. The damage happens all winter — melting snow just reveals it, usually in March and April.
Q: Do home remedies like castor oil get rid of moles? A: Castor-oil repellents have only a short-lived effect and university extension testing finds them unreliable. Because moles are drawn to grub-rich soil, the most effective long-term approach combines population control with grub treatment, which removes their food source.
Q: Can you get rid of voles permanently? A: Voles reproduce quickly and move between properties, so one-time treatments rarely last. Consistent, ongoing control — ideally coordinated with neighboring properties — is what keeps populations down long-term, which is why Green Oasis offers Vole Defense as a monthly program with a $25 neighbor-referral discount.
When to call
If you’re seeing fresh mounds or new trails, the population is active right now — and with both pests, early treatment is dramatically cheaper than repairing a lawn that’s been fed on for a full season. Our licensed technicians cover western and northwestern Wisconsin and the eastern Twin Cities metro, and we’ll identify which pest you actually have before recommending anything.
