My understanding, unless there are prohibited signs or it states it in specific rules you are allowed. But I have seen that where there is no rules against the carry several areas prohibit the discharge. Now does that apply to target practice or defensive use that is unclear . I would assume the former instead of the later, others that are open to hunting have statements about so many feet from campsite, structures, and roads. Myself I would not go and target practice in a state park, but I am also not going to leave myself or my family without defensive options.