Thanks to Obama, no seriously, you are allowed to carry firearms in almost all national parks.

https://www.nps.gov/articles/firearms-in-national-parks.htm

https://www.nbcnews.com/id/wbna35484383

Got to see them live at Red Rocks in June. Pouring rain, 40 degrees and windy, and despite the weather it was one of the best live shows I've ever been to. They're an awesome band!