Mostly very steep, west- and south-facing limestone. Threshold has some of the hardest routes in Rock Canyon, but it has a couple of moderates as well.
Hike up the canyon to the fourth stream crossing. Instead of crossing the stream, stay left on the trail on the north side of the stream. Threshold is the second crag with bolted routes on the left (the first is the Mine Wall, with one route).
8 Total Routes
['4 Stars',1],['3 Stars',3],['2 Stars',4],['1 Star',0],['Bomb',0]