It can get quite busy, especially during weekends, holidays, and peak summer months. Weekdays, outside of school holidays, are generally less crowded.
Paleis Het Loo is a popular attraction and can experience significant visitor traffic. Weekends, public holidays, and the summer months (June, July, August) are typically the busiest periods, leading to longer queues for tickets and more crowded interiors and gardens. During these times, visitor flow might be managed with timed entry slots.
To avoid the largest crowds, plan your visit for a weekday, outside of Dutch school holidays. Arriving early in the morning, shortly after opening, or later in the afternoon can also help in experiencing the palace and grounds with fewer people. Checking the official website for expected crowd levels or event schedules can also provide a good indication of potential busyness.