The best time to visit Dehradun is during the pleasant months of March to June and September to November. Spring and early summer (March to June) offer ideal weather, with temperatures ranging from 17°C to 35°C, making it perfect for sightseeing, trekking, and exploring nearby hill stations like Mussoorie. The lush greenery, blooming flowers, and clear skies enhance the natural beauty of the Doon Valley. Monsoon (July to August), although scenic with fresh foliage and misty landscapes, can lead to travel disruptions due to heavy rains and landslides, making it less suitable for outdoor activities. Post-monsoon, from September to November, brings crisp air, revived greenery, and a calm atmosphere, offering another excellent window for travel. Winter (December to February) is chilly, with temperatures occasionally dropping below 5°C, especially at night, but it holds a unique charm for those who enjoy the cold and wish to experience a quieter, less crowded Dehradun. Attractions like Robber’s Cave, Sahastradhara, Mindrolling Monastery, and the Forest Research Institute are best enjoyed in clear, mild weather. Festivals like Basant Panchami and Jhanda Mela, typically held during spring, also provide cultural richness to the visit. Whether you're a nature lover, a spiritual seeker, or someone looking to unwind, Dehradun offers a balanced blend of tranquility and vibrance in its best seasons. Plan your trip based on your preferred activities and weather comfort, but overall, spring and autumn remain the most favorable times to explore this gateway to the Himalayas.