The rules for posting no trespassing signs in New York come from the Environmental Conservation Law, and they are specific: each sign must measure at least 11 by 11 inches, carry the word “POSTED” or a warning against entry along with the poster’s name and address, sit no more than 660 feet apart along the boundary, and be replaced when they fall or fade. Get the details right and you have enforceable trespass protection carrying fines up to $250 and up to 15 days in jail. Get them wrong and a trespasser may have a defense.
What Each Sign Must Say and How Big It Must Be
The minimum sign size is 11 inches by 11 inches. Within that, the wording and symbols must cover at least 80 square inches, roughly a 9-by-9 block of text. These minimums exist so a sign is readable from the boundary, not just up close.
Every sign has to include two pieces of information. The first is the word “POSTED” or a specific warning against entry. The second is the name and address of the person or organization authorized to post the land. A sign that reads only “POSTED,” with the name and address attached, prohibits all forms of trespass: hunting, fishing, trapping, and general entry. If you want to allow some activities and forbid others, spell that out. “No Hunting or Trapping” would still leave someone free to walk the land or fish.
The name and address do real work. They give someone a way to ask permission, and they let law enforcement confirm the person who posted the signs had authority to do so. Signs missing that information can undermine a prosecution.
Where Signs Must Go Along the Boundary
Signs go along the property boundary, no more than 660 feet apart. You need at least one sign on each side of the property, plus one on each side of every corner that can be reasonably identified. Irregular boundaries need more signs than straight ones.
The statute does not set a mounting height. Eye level, roughly four to five feet off the ground, keeps signs visible to anyone approaching. Clear brush and branches that block the view from the boundary line, because a sign hidden behind overgrowth doesn’t give the conspicuous notice the law expects.
Keeping Signs Legible and Intact
Maintenance is part of the law. Illegible or torn-down signs must be replaced at least once a year. A sign that falls in a winter storm or fades until the text can’t be read counts as a gap in your posted perimeter. Walking the boundary annually and replacing anything damaged keeps the posting legally intact.
It is also illegal for anyone unauthorized to damage, hide, deface, or remove a posted sign. Without that rule, a trespasser could simply pull down a sign and argue the land was never posted. If you find tampering, photograph it and report it to your local Environmental Conservation Officer, because sign removal is itself a violation.
Who Has Authority to Post
Only the property owner, a lawful occupant, or someone specifically authorized by one of them can post the land. A tenant can post with the owner’s permission. A hunting club can post leased land if the lease grants that right. Posting land you have no authority over is itself a violation of the Environmental Conservation Law.
One limit surprises some landowners. If the Department of Environmental Conservation has stocked fish on your property with your consent, you cannot post that land against public fishing for five years from the stocking date unless you have a separate written agreement with the department.
Written Notice as an Alternative to Signs
New York law offers a second way to establish trespass notice. You can personally serve a written notice on a specific individual, and that notice carries the same legal weight as posting the entire property with signs. The written notice has to describe the property and include the same type of warning that would appear on a posted sign.
This is useful when you know exactly who is coming onto your land without permission. A hand-delivered written warning removes any argument that the person missed the signs. Once served, that person is treated as if the land is posted, whether physical signs exist or not.
Penalties for Trespass on Posted Land
When someone enters properly posted land without the owner’s consent, Environmental Conservation Officers can make arrests and prosecute. The penalty is a fine of up to $250, up to 15 days in jail, or both. ECL trespass is classified as a violation rather than a criminal offense.
Posting also matters under New York’s Penal Law. A person who walks onto unimproved, apparently unused land that is neither fenced nor enclosed has an implied license to be there unless trespass notice has been personally communicated or posted conspicuously. Posting your land under the ECL satisfies that “posted conspicuously” requirement and removes the implied license, which is why proper signs matter even on land with no fences.
Purple Paint Does Not Work in New York
Over 20 states let landowners mark boundary trees with purple paint in place of signs. New York is not one of them. Purple paint on a tree has no legal significance here. The only ways to establish ECL posting protection in New York are physical signs that meet the size, content, spacing, and placement rules above, or personal written notice served on a specific individual.