The simplest way to minimize risk is to read the entire product label and follow all instructions, especially protective clothing requirements. Be sure to store all pesticides securely and out of the reach of children and pets. Regardless of whether you or a professional applies the pesticide, keep people and pets away from the treated area immediately following application.

If the product requires that you stay off or away from the treated area after application, it will be stated on the label. Although many products used on home lawns have no specific reentry recommendations prescribed by the product label, a good rule of thumb is to stay off a treated area until it has thoroughly dried or settled (for granular products) following pesticide application.

Source: pestfacts.org