To control gnats outside, remove standing water, use outdoor traps, and reduce moisture in the area. Keeping your yard well-maintained and properly draining will prevent gnats from breeding.

Gnats are attracted to standing water and overgrown vegetation in outdoor areas. Removing sources of moisture and maintaining a well-drained yard will help reduce their breeding grounds. Outdoor traps, such as vinegar traps, can catch adult gnats. Keeping your yard free of debris and regularly trimming bushes and grass will make it less attractive to gnats.