I keep a file with the LO permission letters as I use them in off season too. Keep them currant too.Not familiar with Montana, but New Mexico requires written permission of the landowner. Page 26 of the Hunting Regs states, "It is unlawful to enter upon any private property to hunt, capture, take, (blah blah blah) any game animal, without possessing written permission from the landowner or person in control of the land...………………... Licenses issued which have the Ranch name printed on them constitute written permission for that property, and no other permission is required."