Chipmunk Damage to Rock Walls: Humane Trapping and Exclusion

Why Chipmunks Target Rock Walls

Chipmunks burrow into gaps between stones, undermining structural integrity. They're attracted to the shelter and nearby food sources (birdseed, bulbs, insects).

Legal, Effective Control

Trapping

• Use small live-catch traps (e.g., Havahart 1025) baited with peanut butter, sunflower seeds, or oats.
• Place traps along walls, near burrow entrances.
• Check state/local laws—some prohibit relocation; euthanasia may be required.

Exclusion After Removal

• Confirm activity has ceased: stuff newspaper into holes; if undisturbed for 7 days (good weather), the burrow is inactive.
• Fill holes with expanding foam, then cover with hardware cloth or aluminum flashing.
• Seal all gaps at ground level.

What Doesn't Work

• Ultrasonic devices—no scientific evidence of effectiveness.
• Repellents—limited success for established residents.
• Mothballs—illegal for outdoor use in many areas; toxic to pets/kids.

Long-Term Prevention

• Remove bird feeders or use baffles.
• Clean up fallen seed, nuts, fruit.
• Keep firewood and debris piles away from walls.