Theodore Roosevelt Island, a 88-acre national memorial in the Potomac River, is officially open from 6:00 AM to 10:00 PM daily in 2026. The island is managed by the National Park Service and follows these standard operating hours year-round. While the island itself is accessible via a pedestrian bridge from the parking lot off George Washington Memorial Parkway, the parking lot can fill up quickly during weekends. Access is free, but visitors should be aware that there are no lights on the trails, so it becomes quite dark and difficult to navigate after sunset, which occurs much earlier than 10:00 PM in the winter months. Bicycles are allowed on the boardwalk but are prohibited on the inland wooded trails. It is also important to note that while the island stays open late, the restrooms and the memorial plaza area may have slightly different maintenance schedules. Always check for temporary closures due to Potomac River flooding, which can occasionally block the boardwalk or the main entrance bridge.