National park trips require planning. Period.
But some of America's most popular parks also require reservations, particularly during their busy season: summer.
Most requirements are similar to last year's, with a few exceptions.
It's not yet clear whether Mount Rainier National Park in Washington will bring back the timed-entry system it piloted last summer. "No decisions have been made," according to Recreation.gov, the central trip planning and reservation site for more than a dozen federal agencies, including the National Park Service.
Yosemite National Park in California also required vehicle reservations last summer but has not yet revealed plans for this year. The park's website says details are expected "in the near future."
Here are the national parks definitely requiring reservations in 2025: