Chemical Yard Treatment

If you want the most effective single yard treatment, permethrin-based acaricides are what the research consistently points to.

Products like bifenthrin (Bifen IT) and professional-grade permethrin concentrates applied to tick-likely zones reduce populations significantly and the effect holds for several weeks per application. See the acaricides page for the detailed numbers on how effective these products actually are.

The cat household issue: permethrin is toxic to cats, including dried residue on grass. A cat grooming after walking across treated lawn can have a serious reaction. If you have cats, cedar oil spray is the safer yard spray option.

Professional vs DIY

For serious tick problems, professional yard treatment with a licensed applicator is worth considering. Two applications per year, spring and early fall, covering perimeter zones and shaded areas. For DIY, bifenthrin concentrate diluted per label directions and applied with a pump sprayer handles the main exposure zones.