North Rim is open May 15th to October 15 usually.
And sometimes if there has been a heavy snow season they may be late opening May 15. This year we went June 11 and there was still snow on the side of the road in the higher areas.
The answer that drives the roads being open is the weather. Contact Park Rangers every few days to inquire. They don't mind it's their job to insure safe passage
Thanks! Your answer is awaiting moderation.