In summer, state transport runs buses through both routes i.e. Manali - kunzum pass- Kaza and Shimla-Reckongpeo-Sumdo- Kaza. In winters only one bus runs between Reckongpeo and kaza which leaves in early morning to kaza and one bus from Kaza to reckongpeo. Roads are dangerous to drive so if you don't have experience of driving on himalyan roads, don't do it. In winters there are no buses to villages , so only option is to hire a taxi, which is not cheap: every k.m. may cost you 25-40 INR or more ,though it is cheaper than tourist season of summers. The taxi stand has jeeps for hire for fixed rates listed at the booth.
It is also possible to arrange for a trek, jeep safari, yak safari or mountain biking via the office of Ecosphere, which conducts responsible and volunteer travel trips and tours in the region firstname.lastname@example.org. It is also common for people to hitch-hike in this mountain terrain, where the locals are extremely friendly and willing to help.