The best time to visit Dehradun is during the winter and early spring months, from October to March. The weather remains cool, crisp, and pleasant, ideal for sightseeing, trekking, and exploring the city's natural beauty. This season also offers clear views of the mountains and is perfect for enjoying outdoor cafes and markets. It’s best to avoid the monsoon season (July to September) due to heavy rainfall and the peak summer (May–June) when it can get quite hot.