Sign Language
It turns out that there is a point to all of those unfriendly “No Trespassing” signs. Not only are such signs a convenient method to announce the boundary of private property, they also revoke the public’s privilege to lawfully enter that property. Under Section 45-6-201 of the Montana Code (MCA), if a landowner fails to post a no-trespassing notice, entering the property is not technically trespassing (at least until you refuse to leave after the owner tells you to leave).
But having an implied license to enter unposted private property without being arrested is not all it’s cracked up to be. It doesn’t mean you have the right to actually do anything on the property, other than walk around gingerly. Hunting on private property always requires a landowner’s permission, regardless of any failure to post signs, as does pursuing wounded game onto private property.