"The Skyline Boulders, AKA The Danger boulders have been climbed on since the early 1990's. In the early days a few nice cherries were picked, but during a huge snow year in 2009-2010, the area has seen a large pulse of new development. This area holds hundreds of boulder problems ranging from 5.5 to V-Project. It is best to climb here when it is extremely cold. The Skyline boulders is arguably the quickest area to melt out after a large snow storm and is quite enjoyable in miserably cold conditions. The South facing slope provides both excellent boulder problems and a is a great escape from the bitter cold that can make bouldering un-enjoyable in the Flagstaff area. The best access to the boulders is by parking at the Trinity Heights church and following the extensive trail network up and right to the base of Mount Elden. Ice-9 is one of the easiest problems to find at the base of the mountain to orient yourself to the other problems. "