From the Montana FWP regulations Book:
"It is illegal for a person to possess or use in the field any electronic or camera device who's purpose is to scout the location of game animals or relay the information on a game animal's location or movement during any Commission-adopted hunting season."
The way I read this is that the cameras could be used right up to the hunting season just not "during" the season. Personally, I don't have a problem with this regulation.