● ● ● RESERVATIONS REQUIRED USA TODAY Acadia National Park Arches National Park Glacier National Park DON’T VISIT THESE NATIONAL PARKS WITHOUT THEM THIS SUMMER accessing North Fork and Going-tothe-Sun Road from the West Entrance between 6 a.m. and

Every year, it seems that more national parks are requiring timed-entry reservations. Sometimes, it’s just to drive into a park. Other times, it’s for specific, sought-after activities.

This summer is no different, with Mount Rainier and Yosemite joining the mix. The requirements add an extra step and expense for travelers, but they’re not meant to be a hurdle.

“The timed entry system reservation system is not to limit visitation but to spread it out more equitably throughout the day,” Mount Rainier National Park ranger Terry Wildly told USA TODAY in February.

In the past, she said visitors had to wait up to three hours just to enter the popular park, and some caused lasting damage to meadows when venturing off-trail to avoid crowds.

As Mount Rainier rolls out reservations this summer, here’s what other park visitors should know.

How many national parks have timed entry?

Only a fraction of America’s 63 national parks require timed-entry reservations or permits for particularly popular experiences. In most cases, they’re only for certain portions of the park during the busiest times of day.

will require timed-entry reservations for vehicle access to Cadillac Summit Road from May 24 through Oct. 22. There are two types of reservations, Sunrise and Daytime, with varying restrictions. Each reservation costs $6 per vehicle and may only be purchased online, not in the park. A separate $35 vehicle entry fee is also required for the park.

requires timed-entry reservations for all vehicles entering the park between 7 a.m. and 4 p.m. through Oct. 31. Timed-entry tickets cost $2. A separate vehicle entry fee of $30 is also required.

will require timed-entry reservations for vehicles