Top US National Parks to Visit in 2025

March is considered one of the best months to visit U.S. national parks due to manageable crowds and pleasant weather as winter snow begins to melt. Death Valley National Park, known for its extreme summer heat, offers comfortable temperatures in the low 80s during March, making it an ideal time to explore its unique landscapes. Across the country, national parks provide opportunities for adventure and relaxation, appealing to travelers seeking natural beauty and diverse wildlife. In 2025, American Cruise Lines will enhance its offerings with extended visits to Glacier Bay National Park, allowing passengers to experience the stunning scenery and wildlife for longer periods. The Great Smoky Mountains National Park remains the most visited, attracting millions with its free entry and diverse recreational options. Travelers can also explore national parks via cruises, which combine the allure of maritime travel with access to breathtaking natural wonders.