Symptoms
- Raised, winding ridges just under the grass surface
- Small round holes scattered across the lawn
- Grass dying along the tunnel paths
Likely causes
- CommonMoles tunneling in search of grubs and earthwormsMoles create raised surface tunnels while foraging, not to eat plants directly.
- CommonVoles using mole tunnels or creating their own shallow burrowsVoles often reuse mole tunnels and do eat plant roots and bulbs.
- PossibleHigh grub population attracting molesA large grub infestation gives moles an abundant food source, increasing tunneling.
What to do
- Identify raised ridges (moles) versus small clean holes with worn paths (voles) to target the right pest.
- Treat the lawn for grubs if a grub problem is confirmed, since reducing their food source discourages moles from staying.
- Use mole traps placed in active tunnels (test by flattening a section and checking if it's raised again within a day) for direct control.
- For voles, remove ground cover, mulch away from plant bases, and consider vole-specific traps or repellents.
- Fill in and tamp down old tunnels once pests are addressed to prevent regrowth issues.
- Consider professional pest control for persistent or large-scale tunneling across the yard.
Tools and parts
- Mole/vole traps
- Tamper or foot (for collapsing tunnels)
Grub control treatmentSearch: “lawn grub killer treatment”
Mole trapSearch: “mole trap for lawn tunnels”
When to call a pro
A pest control professional can identify the specific species and use more effective, targeted removal methods for persistent infestations.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.