Trespass to land is an intentional tort that protects your right to exclusive possession of your property, and it does not require any actual damage to be actionable. If someone intentionally enters land you possess, causes a thing or another person to enter it, or stays after your permission runs out, they are liable to you regardless of whether anything was broken, taken, or injured. The unauthorized entry itself is the legal injury.
What You Have to Prove
Three elements carry every civil trespass claim: intent, an unauthorized entry, and your possession of the land when it happened.
Intent is the piece most people misread. You do not have to show that the person meant to trespass or even knew they were on someone else’s property. The only intent required is the intent to be where they ended up physically. A neighbor who walks across your lot genuinely believing it is still theirs has committed trespass. The Restatement (Second) of Torts puts it directly: liability attaches “irrespective of whether [the actor] thereby causes harm to any legally protected interest of the other.”1Open Casebook. Restatement (Second) of Torts Section 158 – Liability for Intentional Intrusions on Land A sleepwalker, or someone physically shoved across your boundary, lacks the required intent. An honest mistake about where the line falls does not help the trespasser.
Entry is broader than a footstep over a line. A person is liable if they enter your land, cause a thing or another person to enter it, remain after their right to be there ends, or fail to remove something they are obligated to remove.1Open Casebook. Restatement (Second) of Torts Section 158 – Liability for Intentional Intrusions on Land Throwing debris onto a neighbor’s lot, routing drainage into their yard, leaving construction materials behind, or driving a vehicle across the grass all qualify.
Possession is the third piece. The person suing has to have been in lawful possession of the land at the moment of the intrusion. Trespass protects possession, not ownership on paper, and the distinction matters more than most property owners realize.
Airspace and Below Ground
Property rights do not stop at the surface. The Supreme Court held in United States v. Causby that a landowner “owns at least as much of the space above the ground as he can occupy or use in connection with the land,” and that low-altitude invasions of that airspace are treated the same as surface intrusions.2Legal Information Institute. United States v. Causby et ux. The Court declined to fix a precise altitude where private rights end, but continuous low flights that interfere with your use of the surface can support a claim. Below the surface, the same logic reaches unauthorized drilling, tunneling, or excavation, as well as roots and foundations that push underground onto a neighbor’s parcel.
Overstaying and Failing to Remove
A guest who refuses to leave after being told to go has become a trespasser. The rule applies to objects, too. If equipment you were allowed to store on a neighbor’s lot for a week sits there a month later, the continued presence is itself trespass. The same category covers situations where you had an affirmative duty to remove something from another’s land and did not.
Who Can Actually Sue
The right to bring a trespass claim belongs to whoever has lawful possession, not whoever appears on the deed. This surprises people. A tenant leasing your house generally holds the exclusive right to sue intruders during the lease, and as the landlord you usually cannot bring a trespass action for intrusions onto the rented property because you have handed possessory rights to the tenant.
The same principle covers anyone with a current possessory interest: a life tenant, a licensee with exclusive occupancy, and in some jurisdictions a person in actual possession who cannot produce formal paperwork. The test is whether you had the right to exclusive use and control of the property when the intrusion occurred.
Trespass vs. Nuisance
Trespass and nuisance protect overlapping interests but prove up differently, and getting the category right affects both the evidence and the remedy.
Trespass involves a physical invasion by a tangible thing: a person, a vehicle, debris, water. Nuisance involves interference with your use and enjoyment of the property without a tangible intrusion: noise, odors, light, vibration. For an intentional trespass, the only showing required is the unauthorized physical entry; you do not have to prove harm, and courts do not weigh the trespasser’s reasons against your inconvenience. Nuisance requires substantial harm, and courts balance the severity of the interference against the social value of the defendant’s conduct. A factory that lets fumes drift across your land is a nuisance case. A factory that dumps solid waste on your lot is a trespass case.
Civil vs. Criminal Trespass
Civil trespass and criminal trespass protect the same interest in excluding people, but they work differently.
Civil trespass is a private lawsuit. You file it, you prove it, and the remedy is money damages or a court order. The intent standard is minimal, and the trespasser does not need to have known the land was yours or that entry was forbidden.
Criminal trespass is a crime the state prosecutes, and it almost always requires an element civil trespass does not: notice. The prosecution typically has to show that the person either knew entry was forbidden before they entered or was told to leave and refused. Notice can come from verbal warnings, posted signs, fencing, or in some states specific painted markings on trees or posts. Without that proof, criminal charges often fail on facts that would still win a civil case. This is why calling the police and filing a lawsuit are not interchangeable responses.
Defenses the Other Side May Raise
Not every unauthorized entry produces liability. A handful of defenses recur.
- Consent, whether given in words, in writing, or by conduct a reasonable person would read as permission. Custom supplies implied consent in some cases, such as a mail carrier or delivery driver approaching the front door. Consent can be revoked, and once it is, continued presence becomes trespass.3Open Casebook. Restatement (Second) of Torts on Consent
- Necessity. Someone who enters your land to avoid serious harm to themselves, another person, or property has a limited privilege. A driver swerving onto your lawn to avoid a collision, or someone crossing your yard to rescue an injured person, is shielded from nominal and punitive damages, though they may still owe compensation for actual damage caused by the entry.
- Public authority. Officers with a valid warrant or acting under recognized emergency exceptions can enter without consent. Utility workers and government inspectors sometimes have statutory entry rights.
- Abating a nuisance. A person affected by a harmful condition on neighboring property, such as an overhanging branch dropping debris or a drainage structure flooding their yard, may have a limited privilege to enter and address it. The entry has to be reasonable in scope and method.
What You Can Recover
The remedies run from symbolic to substantial.
Nominal and Compensatory Damages
Because trespass is actionable without proof of harm, courts routinely award nominal damages, sometimes literally one dollar, to recognize that your rights were violated. When the intrusion causes actual harm, such as damaged fences, destroyed landscaping, contaminated soil, or disrupted business operations, compensatory damages cover the cost of repair or the loss in property value.
Punitive Damages
When a trespasser acts with deliberate disregard for your property rights, courts can add punitive damages to whatever compensatory amount applies. This is where the doctrine has real teeth. Courts have upheld six-figure punitive awards for intentional trespass even where actual damages were nominal, on the reasoning that without meaningful punishment, property rights become unenforceable against anyone willing to pay the small cost of the harm they caused. Availability and caps vary by state.
Injunctions
When a trespass is ongoing or likely to recur, money is not enough. Courts can order the trespasser to stay off the property, remove an encroachment, or stop a specific activity. Violating the order exposes the trespasser to contempt, which can carry fines and short-term incarceration. For property owners facing repeat trespassers or a permanent encroachment, an injunction is often more valuable than damages.
Timber Trespass
Cutting or removing trees from someone else’s land is one of the most expensive forms of trespass. A majority of states have statutes imposing double or triple the value of the timber as damages for unauthorized tree removal. The multiplier exists because mature trees can take decades to replace, and their loss often exceeds what ordinary compensatory damages would capture. For valuable hardwoods or large ornamentals, the exposure can be severe.
Deadlines and Continuing Trespass
Most trespass claims are one-off events. Some are not. A fence built two feet over the line, a drainage pipe that keeps emptying onto your land, or a fallen tree the responsible party refuses to remove are examples of continuing trespass.
The distinction controls timing. A one-time trespass starts the statute of limitations clock at the moment of entry, and if you miss the deadline the claim is gone. Trespass limitations periods vary by state, with most falling somewhere between two and six years. A continuing trespass generates a new cause of action for as long as the intrusion persists. Permanent encroachments like buildings or foundations that straddle a line are treated somewhat differently, because the full extent of the harm is knowable from the time the structure goes up, which can start the clock earlier. If you discover a neighbor’s retaining wall sits partly on your land, acting quickly matters.
Children and the Attractive Nuisance Doctrine
Property owners owe almost no duty of care to adult trespassers, but children are treated differently. Under the attractive nuisance doctrine, recognized in some form in most states, you can be liable for injuries to a trespassing child if your property contains an artificial condition, such as a swimming pool, trampoline, or construction site, that is likely to attract children who do not appreciate the danger.
Liability requires several things. You must have known or had reason to know children were likely to trespass. The condition must pose an unreasonable risk of serious injury or death to children. The children must have been unable to recognize the danger. And the burden of making the condition safe has to be small compared to the risk. Fencing a pool is cheap, so failing to do so creates strong liability. Dealing with a natural pond on a large farm is a different calculation. The doctrine applies only to artificial conditions, not natural features.
Why Ignoring Trespassers Is Risky
Left alone long enough, unauthorized use can change your property rights permanently. Two doctrines make that possible.
Adverse possession lets someone who uses your land openly, continuously, hostilely (meaning without permission), and exclusively for the full statutory period eventually claim legal title. The required period varies widely by state, from as few as five years to as many as thirty. Walking across a back yard occasionally does not meet the standard. Building a shed, farming the land, or maintaining a garden might. The adverse possessor does not automatically take title when the clock runs out; they still have to bring a court action to have title transferred.
Prescriptive easements work the same way but produce a right to use the land for a specific purpose rather than ownership. The textbook example is a path across someone’s property to reach a road. If the use continues openly and without permission for the required years, the user gains a permanent legal right to keep using it. You keep title but lose the power to block that use.
For property owners the practical point is simple. If you notice someone using your land without permission, address it. Granting written permission actually helps, because it destroys the hostile element and keeps the clock from running. Doing nothing is the one response that can cost you part of your property.