They are a real pain in the but. I have had them off and on for years. I had some success with mole bait from Agway. You do have to be aggressive and keep at it to control them. I am assuming that there are mounds showing up with their tunnels or burrows between them, I fill the tunnels with the bait. The only way to tell if they are active is to flatten their tunnel and check back shortly. If they are still alive the tunnel will be repaired.
Chipmunks also have holes and tunnels, but no mounds. A pellet rifle helps control them.
I did find that when I treated my property for grubs they became less active.
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