Last Updated on October 20, 2026 by Umar Farooq
Moles under pavers are almost always running in the soft soil beside and just below the patio, not tunnelling through compacted stone. The damage shows up as a dip or a rocking paver at the edge of the field, or a ridge of raised soil in the lawn that stops at the patio. Trap the runway that is actually being used, fill the void they left, and reset the pavers that moved. Poisons, gadgets and castor-oil sprays are mostly a waste of money.
Below is how to tell a mole from the other things that dig, where they go around a patio, and the order I would do the fixes in.
Is it a mole or something else?
Moles are insect eaters. The Almanac's mole guide says they eat grubs, earthworms and other soil insects, not plants, and the Rutgers fact sheet on mole management adds that damage to bulbs and seeds is often done by mice and voles using the mole's tunnels. Sorting out which animal you have decides what you do next.
| Sign | Likely animal | What it means for the patio |
|---|---|---|
| Raised ridges of soil, volcano-shaped mounds | Mole | Undermined soil beside the edge, not plant eating |
| Surface runs in grass that fade when grass regrows | Vole | Not a paver problem, usually |
| Chewed plant roots, bulbs gone | Vole or mouse using mole tunnels | Different fix; see the rodent article below |
If you suspect rats or mice instead, our guide to rodents under pavers covers the exclusion side.
Why a mole runs along your patio edge
Rutgers says deep runways sit 3 to 12 inches below the surface and nests 12 to 18 inches down, and that moles often dig deep runways along sidewalks, driveways and other man-made borders. A patio is a man-made border. Concrete paths are even described as a sign of a main runway.
Here is the arithmetic, which is my own and not a Rutgers claim. A 2 3/8-inch paver, one inch of bedding sand and the minimum four inches of compacted base (ICPI Tech Spec 2) add up to about seven and a half inches. A runway at 3 to 12 inches down is the same band as your base. Moles will not dig through well-compacted crushed stone, but they will happily dig the soft soil at its side and under its lower edge. That is where I would look first.
The same fact sheet says surface tunnelling peaks in spring and fall, or after warm rains, and that moles move deeper in winter and dry summers.
Trap the runway, and skip the gadgets
Rutgers calls trapping the most effective control and notes that mole numbers are low, about two to three per acre of turf, so removing one often clears the problem. Its method:
- Find a main runway. Concrete or pavement edges are a good place to start.
- Tamp or poke holes in the run. If it gets repaired within one to two days, that is an active run.
- Set a harpoon trap there (the easiest type, per Rutgers). Check it daily and move it if nothing is caught in three to four days.
The Almanac calls trapping a last resort and suggests live trapping and relocation, which is a different philosophy from lethal traps. State and local rules on trapping and relocating wildlife vary, so check yours before buying anything.
My opinion, backed by the extension source: do not buy repellents or poison bait first. Rutgers says there is no consistent scientific evidence that castor-based repellents work, and that poison baits are ineffective and can harm pets and wildlife. The Almanac, by contrast, lists a castor oil and dish soap spray among humane deterrents. They disagree, and the extension fact sheet carries more weight with me. Grub killer is contested too: the Almanac suggests nematodes, while Rutgers says grub control gives little lasting relief because moles also eat earthworms. (A pinwheel in the lawn is cheaper than either and has about the same evidence.)
Can joint sand keep moles out?
K&R Landscape, a paver contractor, advises filling the joints about halfway to two-thirds full with polymeric or brick sand to keep insects and moles out. I could not find a study that tests this. My own reading: moles reach a patio through the soil at its sides, not through the joints from above, so full joints are good for other reasons (see polymeric sand problems) and will not hurt, but they are not a mole barrier.
Note too that manufacturers want the joints fuller than half. The Alliance Gator SuperSand G2 data sheet calls for a minimum joint depth of 1 1/2 inches and finished sand at least 1/8 inch below the paver top.
A barrier is for new builds, not rescues
Rutgers describes buried hardware cloth or aluminum sheeting as a long-term but costly barrier for high-value plots, buried about 2 feet deep with a 3-inch outward bend at the bottom. On an existing patio you cannot get that near the edge without lifting pavers, so think of it only for a new build in bad mole country.
Fixing pavers the mole already undermined
Once the trap has done its job, the repair is the same as for any soft spot: lift the affected pavers, fill the void with crushed stone in thin lifts, compact it, re-screed one inch of sand, relay and re-sand. Our guide to how to fix sunken pavers walks through it, and paver edging covers re-seating a restraint that has lost its support.
If the edge restraint has shifted, fix that first. A dip that grows after one rain is a base problem wearing a wildlife costume.
Trap one runway, then rebuild the edge
For moles under pavers, do these in order: confirm it is a mole, trap the active runway beside the patio, refill and compact the voids, reset the pavers and the edge restraint, and keep the joints full. The mole will not bill you for the tunnel, but the patio will.
FAQ
Can moles dig under pavers?
They can dig in the soil under and beside the edge of a paver patio, but they do not usually dig through a well-compacted stone base. The problem shows up as a dip or loose pavers at the edge.
How do I tell a mole from a vole?
Moles push up ridges of soil and volcano-shaped mounds and eat grubs and earthworms. Voles make surface runs in the grass and eat plant roots and bulbs.
Will polymeric sand keep moles out?
A paver contractor says filling the joints helps keep moles and insects out, but I found no testing of that claim. Moles mostly come from the soil at the sides, so use polymeric sand for joint stability, not as a mole barrier.
What is the best way to get rid of moles near a patio?
Extension sources rate trapping on an active runway as the most effective method. Repellents and poison baits have little evidence behind them, and trapping rules vary by state.
How do I repair pavers that sank because of moles?
Lift the pavers, fill and compact the base in thin layers, re-screed the bedding sand and relay. The restraint along the edge may need resetting too.
