Rockfish Gap Hawk Watch on Afton Mountain. 10AM to 3PM. Each fall over 20,000 raptors migrate through Rockfish Gap, and we count them all! Come join us as we witness this great migration! Peak migration occurs in the final two weeks of September. During this time we can get 50-100 visitors on the weekends who come to enjoy the raptor show of as many as 10,000 hawks on a single day. 434-249-2927.