There’s also a spacing rule: the purple lines should be placed approximately every 100 feet along the property boundary. This ensures that anyone walking through won’t accidentally miss the warning.
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However, not every state permits this system. Some have officially adopted what’s called the “Purple Paint Law,” while others don’t recognize it at all. States like Texas, Illinois, Missouri, and North Carolina consider purple markings to be a legal stand-in for posted “No Trespassing” signs. But in places without such laws, that purple paint won’t carry legal weight—it might just confuse passersby. Always check your local statutes before relying on this method to mark your land.
