The best time to visit Tosh in Himachal depends on your preferences and the activities you are interested in. The summer months of May to June and September to October are generally considered the best time to visit, as the weather is pleasant and suitable for outdoor activities such as hiking and sightseeing. If you are interested in skiing, the winter months of December to February can be a good time to visit, although the weather can be very cold at that time of year.