If you are the adventurous kind you can surely try out Winter Spiti. Spiti in December will be fully covered in snow and you will get to experience one of the best terrains in Himachal Pradesh. Also, the roads are worth travelling. In winters you can cover Nako, Tabo, Kaza and the adjoining Langza, Hikkim nad Komic
Hello friend if you want to plan your winter trip in Himachal Pradesh then Start with 1. Jibhi, Jungle Book Mulberry Tree House, than go to 2. Gadagushaini village in Tandi, then enroute to 3. Shimla and take a Bus to Spiti via Kinnaur. These three places are best to experience the extreme snowfall and Spiti better known as the Middle Land is best among three for Snowfall.
Happy Journey....
If you want to stay in a snow clad mountain, Glampeco at Sethan is the best place. Other thatln that following are the best options:
Jibhi
Naggar
old Manali
Kalga