National Public Lands Day happens every year on the fourth Saturday in September and this year, it falls on Sept. 26.
Some of the national parks that are waiving their fees on Saturday include the Grand Canyon National Park in Arizona, Joshua Tree National Park in California, Rocky Mountain National Park in Colorado, Everglades National Park in Florida and Yellowstone National Park in Wyoming.
Aside from National Public Lands Day, the NPS also has five other free entrance days during the year.
This year, there’s only two left: National Public Lands Day on Saturday and Veterans Day on Nov. 11.