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The U.S. National Park Service has announced four days this year where you can explore the great outdoors for no price at all.

Mark your calendars, budget travelers: The National Park Service recently announced its “entrance-fee free” promotions throughout 2018. On these days, the more than 100 park sites that normally charge visitors to get in will offer complimentary admission to everyone. In total, there are four free days throughout the year. They include:

- January 15: Martin Luther King Jr. Day

- April 21: First day of National Park Week

- September 22: National Public Lands Day

- November 11: Veterans Day

“National parks connect all of us with our country’s amazing nature, culture, and history,” National Park Service deputy director, Michael T. Reynolds, said in a statement. “We hope that these fee-free days offer visitors an extra incentive to enjoy their national parks in 2018.”

It’s important to note that this waiver does not include fees for activities such as commercial tours, transportation, or campsites and third-party concessions. 

Ready to get out there? Check out our top National Park trip ideas and tips.

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