Is it illegal to shoot someone on your property?

Generally illegal unless you act in lawful self-defense against an imminent threat.

Shooting someone on your property is generally illegal and constitutes a serious crime such as aggravated assault or homicide unless the shooter can prove a legal justification like self-defense. Most jurisdictions require that the person on your property posed an immediate threat of death or serious bodily harm for the use of deadly force to be considered lawful. Simply trespassing or committing a property crime is usually insufficient to justify a shooting in most U.S. states. You must be able to prove that the force used was necessary and proportional to the threat faced.