Tunnels in Grass: Mole or Vole? How to Tell in Seconds

Tunnels in a lawn come in two distinct styles: raised, spongy ridges you can feel underfoot are mole feeding tunnels just below the surface, while flat, worn trails clipped into the grass itself are vole runways. Moles hunt worms and grubs under your turf; voles eat the grass and bark on top of it — so telling them apart decides everything about what to do next.

Most likely causes

  • Moles — raised ridges of lifted turf that give slightly when stepped on
  • Voles — flat, 1- to 2-inch-wide paths of clipped grass connecting small open holes
  • Shrews and mice — borrowing existing mole and vole tunnels rather than making their own

Compare the possible causes

Possible cause Key signs When it happens How likely
Moles (raised surface tunnels) Winding ridges of pushed-up turf, roughly 2 to 3 inches wide, that feel soft and collapse a little underfoot Spring and fall peaks, when moist soil keeps earthworms in the top few inches; also after irrigation or rain in summer Very common
Voles (surface runways) A network of flat, bare or close-cropped trails about the width of a garden hose, weaving through the grass and dead thatch, dotted with inch-wide burrow openings Year-round; the network is most dramatic right after snowmelt in late winter and early spring Very common
Shrews and deer mice (tunnel tenants) Activity in existing tunnels — dime-size side holes, seed caches, or sightings — without new ridges or fresh runway clipping Any season; most often noticed in fall and winter Less common

Visual clues to check

  • Step gently on the tunnel: if it's a raised ridge that compresses underfoot, it's a mole; if it's a flat worn path, it's voles
  • Look at the grass along the trail: clipped, chewed-off blades and green droppings the size of rice grains mean voles
  • Check for volcano-shaped dirt mounds nearby — mounds plus ridges confirm moles
  • Find the holes: vole runways connect open inch-wide burrow entrances; mole tunnels have no open holes at all
  • Stamp down a section of raised tunnel and check tomorrow: re-raised turf means that mole run is active
  • Inspect the base of young trees and shrubs for bark gnawed in a ring near the soil line — vole damage
  • After snowmelt, photograph the exposed trail network before it greens over; it maps the vole population for you

The causes in detail

Moles (raised surface tunnels)

A mole swims through the top layer of soil hunting earthworms and grubs, heaving the turf up into a ridge as it goes — you're seeing the roof of the tunnel, not a path. Feeding tunnels wander and branch, and many are used exactly once. A single mole can add 15 feet or more of tunnel in a day, which is why damage seems to explode overnight. Grass over tunnels browns when the lifted roots dry out, but moles never eat the plants themselves.

Voles (surface runways)

Voles are stocky little rodents that live on top of the soil under the cover of grass, thatch, or snow. They clip grass blades to the crown to build their runway system, travel it constantly, and keep multiple clean burrow entrances open along the routes. The classic reveal is spring snowmelt exposing a maze of trails, chewed grass, and scattered droppings. Beyond lawn scars, voles girdle young trees and shrubs at the base — often the more expensive damage.

Shrews and deer mice (tunnel tenants)

Mole tunnels and vole runways are highways for other small mammals. Shrews patrol them hunting insects, and deer mice use them for cover and travel, sometimes punching tiny access holes of their own. If tunnels stay busy after the original digger is gone, a tenant is likely. Shrews are beneficial insect-eaters and need no control; mice matter mainly if the runways lead toward your foundation.

When to worry

  • Runways converging on young fruit trees, ornamentals, or foundation shrubs — girdling can kill them in one winter
  • Tunneling so extensive that walking the lawn feels spongy everywhere, which means multiple active moles
  • Ridges heading under walkways, patio edges, or shallow irrigation lines that can be undermined
  • Vole trails and burrow holes concentrated along the foundation or under deep mulch against the house
  • Turf browning in stripes over tunnels during summer heat, when lifted roots dry out fastest

What to do now

  1. Make the one-second diagnosis first — raised ridge versus flat path — because mole and vole fixes are completely different
  2. For moles, press active tunnels back down with your foot or a roller and water the lifted turf so roots reconnect
  3. Reduce mole food gradually by managing heavy grub populations, but expect worms (which you want) to keep some moles around
  4. For voles, mow short in fall, rake out thatch, pull mulch back from trunks, and clear tall cover — exposure is their enemy
  5. Protect young trees with hardware-cloth cylinders sunk a few inches into the soil
  6. Reseed clipped runways in spring; vole trails green back in within weeks once the cover is gone
  7. If moles keep rebuilding despite flattening, or voles are girdling valuable plantings, bring in a licensed wildlife control professional — correctly placed traps are what actually works

What not to do

  • Don't buy sonic spikes, mole plants, or castor-oil miracle cures expecting results — evidence for all of them is weak
  • Don't fumigate tunnels with car exhaust or smoke cartridges near the house; it's hazardous and rarely reaches the animal
  • Don't put poison grain baits in open runways where songbirds, pets, and raptors can get to them
  • Don't kill the lawn's earthworms to starve out moles — you'd wreck the soil to evict a cosmetic nuisance
  • Don't ignore vole runways heading into landscaped beds just because the lawn damage looks minor

Think you know the suspect?

These animals commonly cause this clue — see their full sign profiles:

Frequently asked questions

What's the quickest way to tell mole tunnels from vole tunnels?

Height. Mole tunnels are raised — the turf is pushed up into a soft ridge because the mole travels underneath it. Vole runways are flat or slightly sunken paths of clipped grass on the surface, connecting small open holes. If your foot sinks a ridge, it's a mole; if you're looking at a worn trail, it's voles.

Do tunnels in the grass mean I have a grub problem?

Not necessarily. Moles eat earthworms first and grubs second, so a mole can be working a perfectly healthy lawn. It's worth peeling back a square foot of turf in a tunneled area and counting grubs — more than a handful suggests treating the lawn's grub load — but voles are after grass and bark, not grubs at all.

Will the grass over the tunnels die?

Sometimes, temporarily. Mole ridges lift roots away from soil, and in hot, dry weather those strips brown out; pressing tunnels down promptly and watering usually saves them. Vole runways look worse — grass clipped to the crown — but the crowns typically survive, and trails fill back in within a few weeks of spring growth.

How many moles are actually in my yard?

Almost always fewer than the damage suggests. Moles are solitary and territorial, and a single animal can maintain a network covering most of a suburban lawn, adding many feet of tunnel per day. Two or three moles is a heavily populated yard, which is why removing even one changes things dramatically.

Related yard clues

Yard Holes Dirt Mounds in Lawn: Mole, Gopher, or Ant? Read the Shape The shape of a dirt mound is the fastest identification tool in the yard: moles build round volcano-shaped mounds with no visible hole, pocket gophers build fan- or crescent-shaped mounds with a plugged hole to one side, and ants, earthworms, and digger bees leave much smaller piles. Match your mound to one of those shapes and you've usually named the animal. Read the guide → Yard Holes Holes in Lawn With Dead Grass Around Them: What It Means When holes and dead grass show up together, the dead grass is usually the underlying story: grubs kill turf roots and then skunks, raccoons, and birds dig holes going after them, while vole runways, yellowjacket ground nests, and dog urine spots each pair dying grass with their own style of hole. Figure out whether the grass died first or the digging came first, and the diagnosis usually follows. Read the guide → Yard Holes Small Holes in Yard With No Mound: What's Digging? Small holes in your yard with no dirt mound are usually caused by squirrels, chipmunks, foraging birds, earthworms, or ground-nesting insects. The size of the hole, how deep it goes, the time of year, and whether the damage appeared overnight can narrow down the cause quickly. Read the guide →

Still not sure? Compare with these clues

Lawn Problems Spongy Lawn That Lifts Up? Grubs, Thatch, or Moles Below A lawn that feels spongy underfoot or lifts up like carpet usually means one of three things: white grubs have eaten the roots, a thick thatch layer has built up under the grass, or moles are tunneling just beneath the surface. A simple tug on the turf and a look underneath will tell you which one you're dealing with. Read the guide → Yard Holes One-Inch Holes in Lawn: Identify the Digger by Size Holes about an inch wide in a lawn are most often the work of voles, young chipmunks, ground-nesting bees, or — in wet, low-lying yards — crayfish. An inch is a telling size: it's too big for most insects and too small for rats or full chipmunk burrows, so checking depth, soil, and location will usually name the digger. Read the guide → Lawn Problems Brown Patches in Grass: How to Read What Killed the Turf Brown patches in your grass are most often caused by fungal disease, white grubs eating the roots, dog urine, or summer drought dormancy. The pattern is the diagnosis: circles point to fungus, turf that lifts like carpet points to grubs, and small spots ringed with dark green grass point to dog urine. Read the guide →