Trongsa Dzong, Bhutan's largest and most impressive fortress, is a historically significant landmark requiring a moderate level of physical accessibility due to its ancient architecture involving stairs and uneven paths, not fully wheelchair accessible. For international tourists, a guided visit arranged through a licensed Bhutanese tour operator is generally mandatory as per the country's tourism policy, which bundles costs including entrance fees, accommodation, food, and transport into a daily package (e.g., Sustainable Development Fee of $100 per person per night). The Dzong is open year-round, though the spring (March-May) and autumn (September-November) offer the most pleasant weather, while monsoons (June-August) bring rain and winters (December-February) are cold. A typical visit duration is 1-2 hours, allowing ample time to explore its courtyards, temples, and take in the panoramic views. Visitors should dress modestly, covering shoulders and knees, and respect photography restrictions within temple interiors.