Among the most popular rock climbing destinations in the world, Castleton Tower has been summitted by thousands. Climbing historian Stewart Green reports that the number of successful ascents is over 40,000 and there have been so many that no one really knows how many folks have reached the summit. The first ascent was completed September 16, 1961 by Layton Kor and Huntley Ingalls. Their route of ascent is still one of the most popular and carries their name, the Kor-Ingalls Route, and is rated 5.9. Today there are named routes of ascent on every aspect of the tower.