Hi all. Have you tried using nematodes in your yard? They are microscopic organisms that eat flea larvae. They are purchased in a sponge and watered into the yard. I don't have a problem with fleas. I use frontline in the warmer months since we go to the park, etc., but I've had great success with the nematodes. I'm a little "crunchy", and I do prefer a non chemical solution when possible
Juliet