The hike begins as if going to Lake Agnes, along with the throngs of other hikers bound there. Near the lake, you’ll turn onto the less-busy trail to Little Beehive, then turn again onto the nearly empty trail that switchbacks up the rock-strewn face of Saint Piran. It is a straightforward hike once the snow has melted, but very steep. At the top, you’ll have sublime views over the lake far below, and the surrounding taller mountains.

The prime season for this hike is June to September, on any day that the weather is good. Avoid any days with risk of storms because most of the hike is completely exposed above treeline. In the early season and late season, the route is likely to have snow, so you should bring traction devices and possibly other equipment, depending on conditions.

Sources: https://www.summitpost.org/st-piran-scramble/165478