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Take cinnamon, sprinkle ever so lightly where ants like to come in, even outside. They will not cross the cinnamon line!
I tried this in my kitchen recently because the sugar ants were starting to show up on my countertops. I scattered cinnamon behind my sink, which is where they seem to get into the house. I haven't seen an ant in days! I even left a box of donuts on the counter and they have been left entirely alone. Seems much safer than using ant poison or boric acid in my kitchen.
Spread some ground cinnamon where you think the ants are coming into the house.