A buffer zone is an area that surrounds an application block where only specially trained and equipped pesticide handlers may enter. The application block is the area where the fumigant is being applied to the soil.

Buffer zones are intended to provide an extra band of safety around a fumigant application block. By keeping the buffer zone off limits during and usually for 48 hours after a fumigant application, potential exposure to the fumigant is minimized.

Buffer zones can include roads. Cars and bikes are allowed to drive on roads through a buffer zone.

The size of a buffer zone will depend on factors such as the particular soil fumigant product used, the application method, the application rate, and the size of the area being treated.