2. How Long Are Ground Rods?
Ground rods come in both 8′ and 10′ lengths, however, an 8′ ground rod is the common size used in residential installations. As a rule, ground rods must be a minimum of 8′ long, so do not cut them off! If you are in very dry ground, you may want to consider a special clamp that allows you to stack ground rods.
Another option is to add a second ground rod, which is a better option, but remember that the NEC requires them to be a minimum of 6′ apart. If possible, try to get the ground rods in a moist area around your home. Usually, the area close to the exterior wall has enough moisture due to runoff water from downspouts.