Reservations Could Potentially Become A Requirement To Visit RMNP Plan on visiting Rocky Mountain National Park? You might need to start making reservations - permanently - before you go. According to the Denver Post, the next step in a process that could very well result in a permanent reservation system for Rocky Mountain National Park will be taken starting this week, when a 60-day public comment period begins. Get our free mobile app Two informational webinars regarding a plan to manage the impacts of explosive visitation growth at Rocky Mountain National Park will be held on Thursday, May 20 and Tuesday, May 25; both webinars are open to the public.