Yes Imran bhai October/November is a good time to visit, December gets a bit colder and between mid December to Mid January we usually have fog in different surrounding areas, which is not a good time for bike ride. Then from end of February till end of April is a good time to visit Soun valley and after than weather gets hot. Although one of my tours of Soun valley (the only tour involving adventure) was done in August but the hot weather was telling on our faces and we returned home quite exhausted. So it is better to visit the valley during above mentioned months.