Typically, you develop a vole problem because you have things attracting them to your yard. They love fruits and nuts, so if you have trees that produce these food items, voles may come from all around. They'll also come for vegetable gardens and landscaping with healthy, vigorous root systems. Aerated soil that's loose and easy to burrow through will also attract voles. Basically, if you take good care of your lawn, voles may take notice.