Yep, in my native CO it even states in the hunting regs that it is the responsibility of the hunter to know where the boundaries are and that they are solely responsible for staying off private property whether it is marked or not. Personally I've always kind of thought if the ranchers are that worried about it they should be required to fence their land, but the state says they don't have to.

Thankfully I've never had a problem since the ranchers where I hunt aren't too concerned if someone steps on their land for a few feet to access public ground. Being so boneheaded about it could actually be counter productive because if they prevent the public from hunting public land then I can see to that leading to some deer/pronghorn/elk being shot out of their hay meadows in spite. Not condoning such actions mind you, but I could see it happening especially on some of the bigger places where the meadows may be 5 or 6 miles from the ranch house. Some of these ranches are more than 100,000 acres.