Climbing Yosemite’s Half Dome requires strength, stamina and a whole lot of bravery.

Come May, it will require a day-use permit.

With growing concerns about over-crowding and safety on one of the park’s most famous slabs of granite, park officials announced this morning an “interim” two-year plan that will place a cap on the number of climbers on Fridays, Saturdays, Sundays, and holidays.