A non-toxic insect repellent concentrate formulation utilizing a plurality of all natural active components has been proven to be effective in repelling mosquitoes for periods of between six to eight weeks, with one application. The insect repellent concentrate formulation includes a plurality of natural essential oils comprising at least one emulsifying agent to maintain the oils in a stable solution. A pH conditioning agent may be added to assure the formulation is pH balanced for application to grass, plants, and trees, without detriment. The formulation may be provided as either a concentrate, or at dilutions ready for direct application, and may be applied by any of a variety of methods including broadcast spraying, boom applicators, misting systems, aerosol spray devices, etc.