LOS ANGELES (AP/CBS13) — Climbers in Yosemite National Park will need to secure permits before they can attempt multiday climbs on El Cap, Half Dome, the Leaning Tower and other big climbs beginning May 21.

The park added red tape to cut through before climbers can begin the physically grueling and mentally demanding feat of inching up vertical granite walls that take days to conquer and require spending the night on tiny platforms suspended hundreds or thousands of feet above Yosemite Valley.

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The long-rumored plan will inevitably cause some grumbling in a climbing culture that embraces freedom but could also help limit the number of people on classic routes that have become more crowded as the sport has grown in popularity.

“I think we’re going to have a lot of climbers whining and complaining because they were gifted this thing that they think is a right and it was really a privilege,” said Hans Florine, who with 170 ascents, has climbed El Cap more than anyone. “We were given incredible rag-tag Wild West privileges for the last 40 years in Yosemite. All they’re asking is to let us know you’re there.”

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The two-year pilot program will put climbers on par with backpackers who have been required to get wilderness permits for decades to spend the night in protected backcountry areas of national parks and forests. Unlike hikers, though, the climbing permits will not at first be rationed on a quota basis that limits how many people can be on a designated route each day.

Jeff Webb, the wilderness manager for Yosemite, said the program will measure for the first time how many people are doing overnight or multiday climbs and could eventually lead to limits on certain routes, such as The Nose on El Cap.

The park will seek voluntary compliance but could fine climbers who break the rules, Webb said.

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Yosemite is not the first park to require permits for multiday climbs. Zion National Park in Utah and the Black Canyon of the Gunnison and Rocky Mountain National Parks in Colorado also have permit systems.