Having just returned from a trip that took us to 3 National Parks, Zion, Bryce and North Rim of the Grand canyon, I can assure you that you can and cannot CCW there. While it is legal you are limited in where you can go and how you get there. In Zion for instance, you can CCW but cannot enter any of the buildings (museums, visitors centers), as they are all posted no weapons (guns, knives etc.) and you cannot ride the trams that take you into the heart of the park. If you are carrying you really can't do much or go anywhere. Getting caught where you should not be would be a four alarm disaster. If I had been taking any long hikes I would have packed the MP9c and did keep it pretty much within arms reach while in camp but never did leave the campsite with it. You get the same warnings at all of the other parks.