Fortunately, my neighbor’s cat helps to keep the population under control in my yard. You might think about getting a cat or dog and let them take care of the problem. Or, if that’s not an option, there are plenty of other methods found online. Just search “get rid of chipmunks” and you will find ideas for keeping them out of your gardens and getting rid of them altogether. Getridofthings.com is one good resource. Your local extension agent may have more ideas.
Good luck battling chipmunks!