Overcrowding continues to be a serious challenge at national parks throughout the United States. Some of the more popular national parks have implemented reservation and timed-entry programs, often on a pilot basis, in order to help ease crowding.

As 2024 kicks off and travelers plan getaways for the year ahead, it’s important to know which national parks will continue such programs.

Here’s a rundown of national parks that are maintaining timed-entry or reservation systems for visits in 2024.

At Arches National Park, where visits increased 73% between 2011 and 2021, a pilot reservation program will be continued in 2024.

Reservations for visits taking place between April 1 through Oct. 31 can be made online through Recreation.gov. The reservation process for that time frame opened Jan. 2.

Reservations are available on a first-come, first-served basis. Moving forward, reservation blocks will be released three months in advance of visits — meaning reservations to visit in April will be opened in January, while the opportunity to make reservations for a May trip will open Feb. 1, and so on.

Additionally, there also will be last minute and next-day reservations available beginning March 31 on a daily rolling basis.

If you’re planning to visit specific parts of Glacier National Park, you’ll likely need a vehicle reservation.

For instance, from May 24 through Sept. 8, reservations are required for vehicles visiting the west side of Going-to-the-Sun Road and the North Fork between 6 a.m. and 3 p.m.

Motorcycle visitors need a vehicle reservation or a service reservation and a park entrance fee or valid park pass.

Another of America’s most popular public spaces, Rocky Mountain National Park will continue a pilot reservation system beginning May 24.

There will be two types of reservations. There will be one  permit  for Bear Lake Road Corridor, which includes the entire corridor and access to the rest of the park. The reservation period for this area will be from 5 a.m. to 6 p.m.

The second  permit  provides access to “rest of the park,” excluding Bear Lake Road corridor. This reservation period will cover 9 a.m. to 2 p.m.

Permits issued using the reservation system allow park visitors to  enter the park  within  two-hour  windows of availability, with no set time for departure.

The only cost associated with booking a reservation is a $2 recreation.gov processing fee.

The reservation system will continue through October.

Reservations will be required to drive into Yosemite during two specific periods for summer 2024. However, there will be no reservations required to visit the California park now through Feb. 9. After that date, the reservation system will be as follows:

Feb. 10 through 25: A reservation is required 24 hours a day on Saturdays, Sundays and Feb. 19.

Feb. 26 through April 12: No reservation is required to drive into Yosemite.

April 13 through June 30: A reservation is required from 5 a.m. to 4 p.m. on Saturdays, Sundays, and on holidays (May 27 and June 19).

July 1 through Aug. 16: A reservation is required from 5 a.m. to 4 p.m. every day.

Aug. 17 through Oct. 27: A reservation is required from 5 a.m. to 4 p.m. on Saturdays, Sundays and on holidays (Sept. 2 and Oct. 14).

One of the most beloved parks in the Southwest, Zion will continue to follow a permit program in 2024.

For instance, the park will continue its pilot lottery permit program for hikes to Angels Landing, an experience involving 5 miles of hiking to a steep viewpoint. The lottery will open two months ahead of hike dates.

There will also be a lottery for next-day permits for the Angels Landing hike. This lottery will open at 12:01 a.m. and close at 3 p.m. MT on a daily basis. Those who win the lottery will be notified via email by 4 p.m.

There’s a $6 fee to apply for a permit, as well as a $3 fee per person once the permit is confirmed.

There are no tickets, permits or reservations needed to ride the park’s shuttle or to enter Zion National Park. Most areas of the park beyond Angels Landing do not require a reservation.

While there is no reservation or timed-entry system for Shenandoah National Park, if you want to hike on Old Rag Mountain you’ll need to purchase a day-use ticket. This rule applies from March 1 through Nov. 30.

The cost of tickets is $1 and they can be purchased online at Recreation.gov. A total of 800 tickets will be available for each day. Tickets are released daily at 10:00 a.m.

General entrance to Acadia National Park does not require a reservation. However, if you plan to drive Cadillac Summit Road you will need a vehicle reservation in advance. This year’s specific reservation dates have not yet been announced. Check the park’s website for more details.