The short version
Pennsylvania moles are nongame mammals that Penn State Extension says may be controlled when they cause damage, and trapping an active run is the method that works. Three species live in the state, they burrow 12 to 18 inches down for main tunnels, and activity runs all year with a peak during rainy summer stretches.
- Moles eat earthworms, not plant roots; their tunneling damages lawns.
- Spring and fall are peak seasons for mole activity in Pennsylvania.
- Professional trapping is the most reliable solution, costing $150–$450.
- DIY methods like sonic spikes and poisons are often ineffective.
For Pennsylvania homeowners with fresh ridges or mounds and no idea whether they are allowed to do anything about it, for gardeners who suspect their hostas are being eaten by something other than the tunneler, and for anyone weighing a first attempt at trapping against calling a company. Landlords and grounds managers get the quote questions they need.
What to look for
That timing surprises people who expect a spring-only problem. Pennsylvania's 42 inches of yearly rain and 68 percent median humidity keep worm populations high, and Extension describes mole activity as year round with the busiest periods during rainy summer weather. Penn State Extension notes moles tunnel constantly to find food, and they do not eat roots. What they are after is soil life, mostly earthworms. Only the shallow layer shows on the lawn, which is why homeowners consistently underestimate how much tunnel is actually there. Adults run five to seven inches long, and they build a two-level system, shallow feeding runs just under the sod plus main burrows 12 to 18 inches down where they travel and nest. Penn State Extension records three mole species in the state: the eastern mole, the hairy-tailed mole, and the star-nosed mole.
- 1Surface ridges: raised, meandering lines of soil that indicate active feeding tunnels just under the grass.
- 2Volcano-shaped mounds: piles of soil with a central plug, often found near the edges of lawns or gardens.
- 3Spongy turf: areas that feel soft or sinking underfoot due to underground tunnels.
- 4Wilted or dead grass: root damage from tunnels drying out or from voles using mole tunnels.
- 5Raised soil in flower beds or along foundations.
- 6Fresh mounds appearing overnight, especially after rain.
- 7Visible tunnels lifting up paving stones or walkways.
Why it’s worth acting soon
- Roots along a tunnel lose soil contact and the grass over the run dies out.
- Sunken and collapsed runs make an uneven lawn that is easy to trip on.
- Voles adopt the empty tunnels and begin girdling shrubs and eating bulbs.
- A March or early April litter of three to five young adds animals working the same yard by summer.
- Damage spreading into a neighbor's lawn turns a private nuisance into an awkward conversation.
- Reseeding and topdressing an entire summer of damage costs more than removing the animal did.
Treatment options and typical costs
Harpoon trap on a shallow run
Quoted after inspection
Penn State Extension lists the harpoon among the standard tools for the state. It straddles a surface ridge with spikes driven down through the tunnel roof, triggered when the mole pushes the soil up again. It needs a confirmed live run and firm footing, so the set is easier in settled spring soil than in a lawn softened by days of rain.
- Time
- A few days to two weeks
- Best for
- Clear surface ridges that rebuild overnight
Scissor-jaw or choker-loop trap
Quoted after inspection
Both are set into the tunnel itself rather than above it, which makes them the better choice for the deeper 12 to 18 inch main runs Pennsylvania moles use for travel. You dig into the run, seat the trap, and close the hole so light does not spill in. More work than a harpoon, and better in loose or waterlogged soil.
- Time
- A few days to two weeks
- Best for
- Main runs, and yards where surface sets keep failing
Bromethalin earthworm baits
Quoted after inspection
These are placed down into an open run, imitating the food the animal is hunting. They fit runs that cross under walkways, driveways, or dense beds where seating a trap is impractical. Ask any provider using them to show the label, confirm registration for this use, and explain exactly how the placement is kept away from pets.
- Time
- Days to a couple of weeks
- Best for
- Runs under hard surfaces or thick planting
Gadgets and grub products
Quoted after inspection
Ultrasonic spikes, spinning windmills, castor oil drenches, and flooding a run with a hose all have a long record of not working. Grub killers miss because earthworms, not grubs, are the larger part of the diet. Skipping these is not being lazy, it is spending the same money on tools that finish the job.
- Time
- Not reliable
- Best for
- Little in practice
Prices are typical published ranges. Ask what’s included before you compare quotes.
Round, volcano-shaped mounds come from deeper mole tunnels. Gopher mounds are crescent-shaped with a plugged hole.Mole Biology and Behavior.
they can store extra earthworms, allowing them to store live prey in underground chambers for later consumption. Moles are active day and night, with peaks of activity in early morning and late afternoon. They dig two types of tunnels: shallow surface tunnels (feeding tunnels) and deeper permanent tunnels (travel and nesting tunnels). Moles are solitary, territorial mammals that live almost entirely underground. They have tiny eyes and ears, but rely on their keen sense of smell and touch to find food.
Why Moles Are a Problem in Pennsylvania.
Moles are most active in lawns, golf courses, parks, and agricultural fields. In urban areas, they can undermine sidewalks and driveways. The Pennsylvania Game Commission classifies moles as unprotected mammals, meaning they can be trapped or killed without a permit. Pennsylvania’s climate—cool, moist springs and falls, with mild winters in some areas—creates ideal conditions for moles. The state’s diverse soils, from sandy loam in the southeast to clay in the northwest, support healthy earthworm populations.
Moles have big, spade-like front feet built for digging. They eat earthworms and grubs, not plants.Common Misconceptions About Moles.
Voles, which are small rodents, often use mole tunnels to eat roots and bulbs, leading to mistaken blame. Another myth is that moles are blind; while their vision is poor, they can detect light and movement. controlling grubs does not eliminate moles because earthworms are their primary food. Many homeowners believe moles eat plant roots and damage gardens directly. In reality, moles are insectivores and rarely eat vegetation. The damage to plants is usually indirect—tunnels dry out roots or expose them to air.
The Science of Mole Trapping.
Scissor-jaw traps and harpoon traps are the most common designs. Professionals often use multiple traps and check them daily. Trapping success depends on correct placement, tunnel freshness, and minimizing human scent. Trapping is the most effective method because it directly removes the mole. The key is placing traps in active tunnels, which can be identified by pushing down the tunnel ridge and checking if it’s raised again the next day.
What affects the price
- Number of moles: multiple moles increase labor and material costs.
- Property size: larger lawns require more traps and time.
- Accessibility: steep slopes, dense vegetation, or fenced areas may add difficulty.
- Severity of infestation: extensive tunnel systems require more effort.
- Season: spring and fall are busiest, sometimes with higher demand pricing.
- Travel distance: remote rural properties may incur extra fees.
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What is the most frustrating thing about moles in your yard?
When to call for help
Large or steep properties are another reason, because checking traps daily on an acre stops being realistic quickly. If the real complaint is dead plants rather than lumpy turf, get an identification before you spend anything, because vole feeding and mole tunneling look related and are not. Two weeks of your own effort with nothing caught is a fair trigger to hand it over. So is a damage pattern of mounds without ridges, which usually means the animal is staying in the deep burrow layer and needs an excavated set rather than a surface trap.
What you can do yourself
Whichever way you go, ask for the plan in writing, including how many checks are covered and what happens if the traps come up empty. That saves weeks on a property with heavy damage. Someone who has set a few hundred traps can tell a travel run from a feeding probe at a glance, will set four or five at once instead of one, and knows when to abandon the surface and dig down to the main burrow. Where a professional earns the fee is in reading the system. The tools are cheap and widely sold, and a person willing to confirm a live run before setting will often catch an animal in the first week. Trapping your own moles in Pennsylvania is legal ground most homeowners can stand on, since Penn State Extension describes moles as nongame mammals that may be controlled when they are causing damage.
Where you live matters
Cities as far apart as Erie and Philadelphia sit inside the range of all three resident species. Median home value across those cities is $152,500, which means a lot of Pennsylvania mole damage happens on modest lots where a single run crosses most of the visible lawn. The state spans continental and temperate zones, with a 22F median winter low that is cold enough to push animals into the 12 to 18 inch main burrows for weeks at a time and an 85F median summer high that rarely bakes the soil hard for long. Across the 22 cities in our data the median annual rainfall is 42 inches with 68 percent humidity, and Penn State Extension describes the busiest tunneling as coming during rainy summer stretches rather than in spring alone. Pennsylvania gives moles most of what they want and gives homeowners a long season of dealing with it.
Simple ways to keep moles away
- Fix downspouts and low spots that keep one strip of lawn wet through a rainy summer.
- Water established turf deeply and infrequently rather than lightly every day.
- Keep mulch layers thin so the soil beneath does not hold worms right at the surface.
- Walk the yard once a week in spring and after summer storms, flattening anything new.
- Sink hardware cloth about 12 inches deep around small beds you cannot afford to lose.
- Roll or firm collapsed tunnels so roots regain soil contact before the turf browns.
- Do not buy a grub product expecting it to solve a mole problem.
- Look for clipped stems and stripped bark, the tell that voles have moved into the runs.
A quick sketch of where fresh mounds appear helps pinpoint the active runways.Did you know?
A mole's can store extra earthworms, keeping them alive and fresh for days.
Moles can dig up to an extensive tunnel system in loose soil—that's faster than a human can walk in high heels.
Moles eat a large amount of food every day, which is why they're constantly tunneling.
Questions people ask
Is it legal to kill moles in Pennsylvania?
Penn State Extension describes moles as protected nongame mammals in Pennsylvania that may nonetheless be controlled when they are causing damage, and it lists harpoon, scissor-jaw, and choker-loop traps as the standard tools. That framing matters: control is tied to actual damage on your property. Check current Pennsylvania Game Commission guidance before you start, and ask any company you hire what method they plan to use.
Which mole species live in Pennsylvania?
Three: the eastern mole, the hairy-tailed mole, and the star-nosed mole. Penn State Extension puts adults at five to seven inches long with main burrows 12 to 18 inches below the surface. The star-nosed mole prefers wetter ground and can carry the largest litters. You will almost never see any of them, so the tunnel pattern is what you go on.
When are moles most active here?
All year, with a peak during rainy summer periods according to Penn State Extension. That runs against the common belief that moles are a spring problem. Pennsylvania's 42 inches of annual rain keeps soil workable across much of the calendar, though a hard stretch of the state's 22F median winter low will drive the animals down into their deeper burrows for a while.
Are moles eating my hostas and tulip bulbs?
No. Moles are insectivores that eat mostly earthworms and soil insects daily, as Penn State Extension documents. Chewed roots, hollowed bulbs, and gnawed stems come from voles, which are happy to travel through tunnels a mole built. Look for narrow two inch runways of clipped grass at the surface to confirm voles.
How many moles are in a typical yard?
One or two in most cases. Penn State Extension treats three to five moles per acre as a high population. A single animal can dig up to 150 feet of new tunnel a day by Virginia Cooperative Extension's figure, so the amount of ridge in a lawn says very little about the number of animals living under it.
How long does a mole live, and does it matter?
Penn State Extension gives a lifespan of three to four years, with one litter of three to five young born in March or early April after about a 42 day gestation. It matters because a resident animal is not a passing problem that will resolve itself, and because trapping before that spring litter disperses removes a breeder rather than dealing with several animals later.
Why do I have mounds but no ridges?
The animal is working the deeper burrow layer, 12 to 18 inches down, and pushing spoil to the surface rather than tunneling just under the sod. Surface traps have nothing to grip in that situation. The fix is a scissor-jaw or choker-loop trap seated in the excavated main run, which is the point at which many homeowners decide to call somebody.
Will one hard winter clear them out?
No. Moles do not hibernate, they follow their food down as the surface freezes, and they come back up when it thaws. A quiet January in a Pennsylvania yard with a 22F median winter low usually means the animal is deeper, not gone. The reliable sign is fresh soil after the first spring thaw, which is also the cue to set traps.
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The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Mole Exterminator · Updated September 11, 2026 · How we write these guides