March is one of the best months for mountain views and trekking, but you should prepare for variable temperatures and altitude. Pack layered clothing, a waterproof shell, sturdy trekking boots, and sun protection. Get or confirm necessary trekking permits (TIMS, ACAP) and register with your agency. Arrange travel insurance that covers high-altitude trekking and potential evacuation. For health, stay hydrated, ascend gradually to minimize altitude sickness risk, and consult your doctor on vaccinations and medications. Carry a copy of your passport, visa (visa-on-arrival is available for many nationalities at Tribhuvan International Airport (KTM)), and local currency for immediate expenses.