Is the park open in the second week of September?

Yes, but there are portions of the park that never opened at all this year and will still be closed in Sept. Check the National Park Service website for exact details. We just got back from GNP and even the portions that were open made it a memorable trip. Enjoy!

Yes but call ahead to find out what is open and closed. Not all of the oark has opened up this summer. BaseCampOverland.com Happyrvcamper.com