As the weather gets warmer and more people head outdoors, it’s important to be mindful of where you walk. If you come across a purple fence post or tree, here’s a heads-up: stay away! That purple paint is a clear warning of one thing—No Trespassing.

Property owners can choose to hang “No Trespassing” signs to mark private property, but over time, signs can fade or fall apart. Paint, on the other hand, lasts much longer and still sends the same strong message. That’s where the purple paint law comes in.

The Origins of the Purple Paint Law

Back in 1987, Arkansas became the first state to introduce the purple paint law. Today, 22 states have adopted similar laws that allow property owners to mark the boundaries of their land with purple paint. While some states like Idaho and Montana use orange instead, the idea remains the same: painted posts or trees mean “No Trespassing.”

Initially, many states required both signs and purple paint to enforce the rule, but over time, the need for signs was dropped. However, if you live in one of the 28 states without a purple paint law, you might not be familiar with its meaning.

What the Purple Paint Means

If you’re hiking, hunting, or just exploring the outdoors, and you see purple markings on a post or tree, it’s a signal that the land is private property, and you’re not allowed to enter without permission. It’s the equivalent of a “No Trespassing” sign, but often more durable and visible.

To meet legal standards, these purple stripes must be painted 3 to 5 feet off the ground, measuring at least 8 inches long and 1 inch wide. Additionally, the markings need to be spaced no more than 100 feet apart along the property’s perimeter.

Why Purple Paint?

You might be wondering, why purple? The color was chosen because it stands out and is easy to see from a distance, making it an effective warning. Plus, purple paint lasts longer than traditional signs, which can get damaged by weather or vandalism.

Spreading Awareness About the Law

Since not all states enforce the purple paint law, it’s important to spread the word to avoid misunderstandings. You wouldn’t want to accidentally trespass on someone’s private land just because you didn’t know what a purple post meant. By sharing this knowledge, you can help others stay informed and avoid any legal trouble.

So next time you’re out in the great outdoors, keep an eye out for those purple fence posts and trees. They’re more than just a pop of color—they’re a clear message to keep out.