You don’t actually press trespassing charges against someone yourself. In every state, you report the crime to police, hand over your evidence, and a prosecutor decides whether to file. Your job is to make that decision easy: prove the person knew they weren’t allowed on your property, prove who they are, and get it all on the record through an official police report.
Establish Notice Before Anything Else
Criminal trespass almost always requires more than the physical act of stepping onto your land. The person has to know, or reasonably should know, that they aren’t allowed there. Without that knowledge element, most prosecutors won’t touch the case. Notice is the hinge the whole complaint swings on.
The strongest form of notice is a direct verbal warning. You tell the person clearly to leave and not come back. If they return after that conversation, you’ve locked in the knowledge element. Verbal warnings from the property owner or someone authorized to speak for them satisfy the notice requirement under most trespass statutes.
Physical barriers and posted signs work too. Fences, walls, and locked gates signal that entry isn’t permitted. “No Trespassing” signs placed where a reasonable person would see them count as notice in every state, though some jurisdictions specify minimum sign size or spacing. Over a dozen states in the South and Midwest also recognize purple paint on trees or fence posts as the legal equivalent of a posted sign; Idaho and Montana use orange. If you own rural acreage, check whether your state accepts paint marks, because they last longer than signage along a long fence line.
If you can put notice in writing before there’s ever an incident, do it. A dated text message, email, or letter telling a specific person to stay off your property is hard to argue with later.
Call Police and Document the Incident
If someone is on your property right now, call 911. A crime in progress warrants an emergency response, and officers who catch the person on site remove any later dispute about whether they were actually there. If the trespass already happened and the person is gone, use the non-emergency line for your local police department, or the county sheriff if you’re outside city limits.
Do not physically confront or try to detain the person. Property owners who grab, shove, block, or threaten a trespasser risk assault charges or a civil suit for excessive force, even when the other person was clearly in the wrong. Any force you use has to be proportional to an actual threat, and “they were on my land” alone doesn’t justify contact. Observe from a safe distance, document what you can, and let officers handle removal.
When police arrive, state clearly that you’re reporting a criminal trespass. Be specific and stick to facts: when it happened, how you know the person was unauthorized, what notice was in place, and what evidence you have. The officer will take a formal report and may ask you to sign a sworn statement. That report becomes the foundation of any future prosecution, so accuracy matters more than emotion. Ask for the report number before the officer leaves. You’ll need it to follow up, request copies, and reference the incident if the person comes back.
Evidence That Convinces a Prosecutor
A trespassing complaint lives or dies on evidence. The more you bring to police, the easier you make the prosecutor’s decision on whether to file.
- Identity of the trespasser. A name is ideal. If you don’t have one, write down approximate height and weight, hair color, clothing, tattoos, scars, anything that would distinguish them.
- Photos and video. A clear image of the person on your property is the single strongest piece of evidence you can produce. Get a license plate if a vehicle is visible. Security and trail cameras aimed at entry points give you time-stamped footage that’s hard to dispute.
- Date and time, written down immediately. Memory fades, and “sometime last week” won’t hold up.
- Witnesses. Names and phone numbers of anyone who saw the intrusion. A neighbor who corroborates your account carries real weight.
- Proof of notice. Photos of your signs, fencing, or paint markings. Notes on when and where you gave any verbal warning. Copies of any written warning you sent.
Surveillance footage is powerful, but courts require that video evidence be authenticated, meaning someone can testify to when and where the camera was installed, that it was working, and that the footage hasn’t been altered. Keep original files untouched and store copies separately. If your camera stamps a time, make sure the clock is right. One thing to watch: some cameras also record audio, and roughly a dozen states require all parties to consent to audio recording of a conversation. Video of outdoor areas on your own property is generally fine; audio is the piece that can create legal problems for you depending on where you live.
Ask for a Formal Trespass Warning
One of the most useful tools available to a property owner is a formal trespass warning issued by police. Many departments will complete a standardized form documenting that a specific person has been told to stay off your property. Officers deliver it to the individual, enter it into their records system, and keep it on file for a set period that you can often specify.
The practical value is enormous. A formal warning eliminates any future argument about whether the person knew they weren’t welcome. If they come back, officers can pull up the active warning in their database, and the original form becomes evidence at trial. Even if the person refuses to sign or accept the paper, the warning still counts as long as the officer notes the refusal and confirms it was communicated verbally. The warning must go directly to the individual; it can’t be left with a third party or posted at their address.
If you want a future return trip to result in an easy arrest, ask about a formal trespass warning while officers are already on scene taking your report.
How the Charging Decision Actually Works
Once police finish their investigation and forward the report, the case goes to a prosecutor, typically a district attorney or state’s attorney. That office decides whether charges get filed. The Supreme Court has confirmed that as long as there’s probable cause to believe a crime occurred, the decision whether to prosecute rests “entirely in [the prosecutor’s] discretion.”1Congress.gov. Federal Prosecutorial Discretion: A Brief Overview
Your desire to see charges filed is one factor, not the deciding one. If notice is thin, the trespasser’s identity is uncertain, or the intrusion was minor, the prosecutor may decline. That decision is final. You can’t override it or appeal to a higher authority to force the charge.
As a crime victim, you’re entitled to reasonable and timely notice of public court proceedings and any plea agreements in your case.2U.S. Department of Justice. Crime Victims Rights Act If weeks pass with no word, call the police department or prosecutor’s office and reference your report number. Follow-up calls show you’re invested in the outcome.
Anticipate the Defenses
Knowing the common defenses to a trespass charge helps you shore up weak spots before you file.
- No notice. The most common defense. If the accused claims they didn’t know the property was private or off-limits and you can’t prove otherwise, the case falls apart. This is why documented notice matters so much.
- Consent. If someone else in your household, or an employee at your business, invited the person on, that invitation can negate the charge. Make sure anyone authorized to manage your property knows who is and isn’t allowed.
- Necessity. Someone who entered your land to escape an immediate threat, like a fire or an attacker, can raise a necessity defense. Private necessity covers self-preservation, though the person may still owe for damage. Public necessity, protecting the broader community during an emergency, is a complete defense.
- Claim of right. In boundary disputes, the accused may argue they sincerely believed they had a legal right to be there. Courts require more than a subjective belief; there has to be a factual basis that would amount to actual authorization if true.
If any of these look plausible in your situation, address them before filing. Clarify boundary lines, keep records of who has permission, and make your notice unambiguous.
If Criminal Charges Don’t Move Forward
A civil trespass lawsuit is a parallel path, not a fallback. You can pursue both at once. The criminal case is the state punishing the trespasser; the civil case is you recovering your losses.
The burden in civil court is lower. You need to show by a preponderance of the evidence, meaning more likely than not, that the person entered without permission. Even without any damage, you’re entitled to at least nominal damages for the violation of your property rights. If they broke something, trampled crops, or left trash, you can recover the actual cost of repair or replacement. Civil filing fees for trespass complaints typically run from roughly $55 to $435 depending on the court, and many straightforward cases fit within small claims limits, which cap between $8,000 and $20,000 in most states.
For a repeat trespasser, the real power of a civil case is the injunction: a court order specifically prohibiting the person from entering your property. Violating an injunction is contempt of court, which gives you a much faster enforcement mechanism than filing a fresh police report each time. Courts are especially receptive to injunctive relief when trespass is ongoing or repetitive.