In order to stop chipmunks from digging holes in their yard, remove wood or rock piles. You could "close" off potential entry points with a cement base for plants (known as an L-foot). Finally, a border made with plant-free gravel should be put around the property line in order to keep them at bay. Take these steps and enjoy the result of a pest-free home!
Plant-free gravel border.
L-shaped footer.
Remove wood or rock piles.