Chipmunks are tiny, brown cousins to squirrels characterized by two broad black and white stripes running down their backs. They like to burrow underground and avoid open spaces. They feed on seeds, plants, insects and human food leftovers, with the search for food often leading them into human territory. Chipmunks invading a house usually stick to enclosed areas like attics and crawl spaces. Here, they feel safe and probably feed on insects that made a home there, too. Removing the chipmunks from your crawl space is not a messy or complicated job. It requires just a few supplies and some patience.
Place several live traps in your crawl space, baited with seeds or rolled oats. The chipmunks will investigate the bait and become trapped in the cage.
Check the traps every day to avoid the chipmunks starving to death. Release any trapped chipmunks into a forested area or park, preferably far away from your home.
Continue baiting and checking the traps until you have not caught any chipmunks for about a week. This means most, if not all, the chipmunks have been caught and released.
Put on protective eyewear and a face mask. Spray the entrance and bottom edges of the crawl space with bear mace. This is a concentrated pepper spray solution that the chipmunks will try to avoid, making it unlikely that they will return