Thanks to public transit systems and private tours, you can experience these national parks without having to drive.

You can also have a national-park experience for free another way, by visiting one of the 20 national parks that don’t charge an entrance fee ever. Come and go as you please without dropping a dime.

If you plan ahead, you can save as $50 per visit on your outdoor adventures this year. Here are the dates that every national park in the country will be free to visit in 2025. You don’t need a pass, ...