If you’re planning a trip to the great outdoors for 2024, there are some dates you need to know about. National parks in the U.S. will be free to enter for six days next year.

The free entry days include three holidays: Martin Luther King Jr. Day, Veterans Day and Juneteenth. National parks will also be free on April 20th, August 4th and September 28th.

While the per vehicle charges will be waived, there will still be fees for some activities, like camping and fishing, and parks that are operated in partnership with other parties could charge other types of fees.