Planning a trip to a U.S. National Park in 2025? Whether you're aiming to catch a sunrise at Haleakalā or hike the iconic Half Dome, many popular parks now require specific permits for certain activities. In this guide, we break down the most common timed entry, ticketed entry, and lottery permit systems across U.S. National Parks. Learn how to navigate park-specific reservations for single-day adventures, scenic viewpoints, and challenging hikes. Stay ahead of the crowds with our 2025 National Park Permit Calendar and make sure you're prepared for your next adventure!

As visitation to U.S. national parks continues to rise, many parks are implementing timed or ticketed entry systems to help manage crowds and protect delicate ecosystems. In 2025, parks like Arches, Glacier, and Rocky Mountain are requiring reservations for entry during peak season, and knowing when and how to book can make or break your adventure. From timed entry windows to lottery systems, this guide breaks down everything you need to know to secure your spot and enjoy a stress-free trip to some of America's most iconic natural wonders.