Hurricane Ridge
This site is phenomenal. I visited it in June and there was still a ton of snow on the ground. Plenty of well marked trails and great areas to explore. There is a ski lodge that wasn't operating at the time I visited and a great visitor center with very clean facilities and a gift shop. This area had the most beautiful views you could imagine of all the mountain tops in the area. I highly recommend you visit.
Month of VisitJuly