Q&A for How to Post No Trespassing Signs

State laws for how many signs vary, as well as the type and size of signs. You could look up your state laws online under the topic "no-trespassing signs".

The number would depend upon local regulations for the maximum distances between signs and specific locations, and the shape of your land, which determines the length of the perimeter. For instance, a circular lot has much less perimeter than a square one of the same area, and you would also need a sign near each entrance.

There are laws on both "civil" trespass and "criminal" trespass in most areas. Unless the trespassing is already in violation of criminal laws, the police may simply ask the trespassers to leave, per the owners' request. In many cases, refusal to leave will then result in immediate arrest. This frequently happens when an unruly customer refuses to leave a business.

Yes, a growing number of places have enacted laws that provide for a specific color of paint to be used to signify "no trespassing" at the required locations and intervals. Some stores even advertise the availability of "no trespassing paint colors", such as a specific shade of purple. Most places in the USA, however, still require posting of actual signs, or complete enclosure with a fence or wall.

The fact that land is owned by the public does not always mean the public can enter at any time for all purposes. The agency that administers it may post and enforce "No trespassing" warnings, subject to legal restrictions on government powers. They may call the police or even the National Guard to enforce the public's interest in keeping out trespassers. There can be good reasons for heeding such notices, especially if it's a gun range or wildlife control is underway.

Trespassing laws vary. Just being on someone else's property without their permission is not always "trespassing" at all, unless it it posted or enclosed, or they have been personally instructed to keep out. You would need to find out the criminal and civil trespassing laws in your jurisdiction and either report them to the police (for criminal violation) or hire an attorney to take civil action against them, or perhaps do both.

Anyone intentionally devaluing your property may be liable to civil action for a restraining order and for any damages you can prove to your value.