The Trump administration has changed which holidays qualify for free entrance to national parks. According to SFGATE, Martin Luther King Jr. Day and Juneteenth were removed from the list, while President Donald Trump's June 14 birthday was added. Source: Smith Collection/Gado / Getty MLK Day has traditionally been the first fee-free day of the year for national parks. The holiday is a federal observance held on the third Monday of January and has historically included free entrance and volunteer service events across the National Park Service system.