If you have a kid in the fourth grade, it's time to start planning your next road trip.

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This story originally appeared on money.com.

Good news for families who love the outdoors: The National Parks Service is again giving fourth-graders a free pass to its vast green spaces.

Any child in the fourth grade this year can visit the Every Kid in a Park website starting Thursday (Sept. 1) to obtain a free pass that grants the youngster — plus his or her parents or other adults — access to federally managed lands and waters. That includes more than 2,000 national parks, forests, wildlife refuges, and marine sanctuaries.

The pass is valid between Sept. 1 and Aug. 31, 2017, and gives free entry to fourth-graders and up to three accompanying adults. To get the pass, fourth-graders need to complete an educational activity and print it out.

To celebrate its 100th anniversary in 2015, the National Parks Service gave fourth-graders free passes last year. The promotion was in line with President Barack Obama’s goals to preserve the country’s open space, as well as allow children to experience it. Inspired by the success of the program, the National Parks Service plans to continue it annually for the next 12 years, so every U.S. school-age child will have had the chance to visit the national parks free of charge.

If you have a child in the fourth grade this year, this could present the perfect opportunity to visit one or several of the national parks. Since parks like Yellowstone and Yosemite charge up to $30 per vehicle for visitors, the deal could potentially save you a lot of money. Click here for more information about how to obtain an Every Kid in a Park pass.