There's some stuff called Terro that I use. They have some outside baits that you place in your yard. It's not an automatic fix.....it takes a few weeks but it does work.
http://www.terro.com/products.php?pr...meter_ant_bait
I'm having quite a time with ants in the house. I've gotten rid of most of them but I must still have some coming in somewhere and I can't figure out where to put the bait!!