In Pennsylvania, posted signs matter. Under the state's criminal trespass law (18 Pa.C.S. § 3503(b), "defiant trespasser"), a person commits an offense if, knowing they aren't licensed or privileged to do so, they enter or remain somewhere that notice against trespass has been given.
How notice can be given
The statute lists several ways, including:
- Actual communication, meaning someone tells the person directly.
- Posting "in a manner prescribed by law or reasonably likely to come to the attention of intruders."
- Fencing or another enclosure clearly designed to keep intruders out.
- Purple paint marks on trees or posts that meet the statute's size, height and spacing rules (not available in the state's largest counties).
Defiant trespass is generally a summary offense, and becomes a misdemeanor of the third degree if the person defies an order to leave given in person by the owner or another authorized person.
Practical posting tips
- Post where people actually enter: driveways, gates, trailheads, paths and along road frontage.
- Make them visible: eye level, facing outward, not hidden behind brush.
- Use enough of them: on larger land, post along the boundary so anyone crossing is likely to see one.
- Replace faded signs: a sign nobody can read isn't "reasonably likely" to be noticed.
Stickers for posting
Browse no trespassing & private property stickers, or for rural land see farm & animal stickers and the Farm & Ranch Kit.
This article is general information, not legal advice. Laws change, and hunting, agricultural and local rules can add requirements. Talk to a Pennsylvania attorney about your specific situation.