Although the average chipmunk weighs only 3 ounces, more than one can cause excessive damage to gardens, homes and garages. Chipmunks may damage clothing and toys stored in garages, by defecating and nesting on such items. Chipmunks also may feed on and ruin flower bulbs, dog food, cat food and bird feed stored in the garage. To control chipmunks, you must make repairs to prevent future problems and eliminate existing populations.
Seal holes with caulk or hardware cloth to prevent chipmunks from accessing your garage; attach the hardware cloth with construction staples and a staple gun. You may have to shift stuff in your garage to examine corners where walls meet, where the walls meet with the floor, and where the walls meet with the ceiling.
Completely shut garage doors after you are done in the garage. Gaps between the garage floor and door may permit chipmunks to enter your garage easily.
Bait an unset live trap with sunflower seeds, peanuts and corn kernels. Set the open trap in the garage and allow chipmunks to feed on the bait for two to three days. This causes the chipmunks to associate the trap with food, making the trap more successful when it is set.
Set the trap and bait it with the same nuts and seeds from before. Cover metal live traps with cardboard or cloth to disguise the trap and increase your chances of capturing a chipmunk. Check on the trap every couple of hours to see if you need to reset it, or if you need to get rid of captured chipmunks.
Take live chipmunks at least two miles away and release them into the wild at a national, state or city park. This prevents those specific chipmunks from returning to your garage.
Prevent chipmunks from returning to your garage by storing pet foods in plastic containers and by hanging plant bulbs in mesh bags from the ceiling or hooks on the wall. This eliminates chipmunks' access to these items, causing them to look elsewhere for food and shelter.