Exterior viewing and garden access are free. Museum admission for adults is approximately €17.50, with discounts for children and specific passes.
Access to view the exterior of the Old Assen Castle and to walk through the adjacent Abbey Garden is free of charge. These public spaces are accessible during daylight hours, allowing visitors to appreciate the historical architecture and grounds without an entry fee.
Entrance to the Drents Museum, which occupies the former abbey building and incorporates its history, requires a ticket. For adults, the admission price is typically around €17.50. Reduced rates are available for children, students, and holders of specific Dutch museum cards (`Museumkaart`) or similar passes. It is advisable to check the official Drents Museum website for the most current pricing and any potential combination tickets or special offers.