Student (or faculty) rulebooks apply to those people, over whom the college has control. JMO, if the laws of the state otherwise allow carry on campus (not in dorms or classrooms) then other areas of the campus should be OK.I would google the school and look up the student handbook. They most likely have a policy against firearms. However, having said that I think schools are considered weapon free zones unless you are simply dropping off or picking up students.
Of course, us profs can make any room into a "classroom" by the very act of teaching a class there. Heck, I've taught in the shade of the big ole tree outside my building. (You should feel sorry for the students that had to tote the chalkboard!)