The white water rafting down the Indus and Zanskar Rivers has different experience amidst Himalayan Mountains. The best time for river rafting tourism is from June to October. There are five different grades of rafting, which are:

Grade I: Small, easy waves; mainly flat water
Grade II: Mainly clear passages; some areas of difficulty
Grade III: Difficult passages; narrow in places and with high waves
Grade IV: Very difficult, narrow and requiring precise manoeuvring
Grade V: Extremely difficult. Very fast-flowing waters which can be  manoeuvred only by experts  

 
Few places for river rafting:              
Hemis to Choglamsar Bridge: This is a 3 hours rafting with calm moving water without obstacles. It starts down from the famous Hemis monastery. You will float through villages of Indus valley i.e. Stakna, Shey, Thiksey, Choushot and then Choglamsar at finishing point.
   
Phey to Nimoo: Second or third grade rafting starts from Phey around 12 Kms. from Leh towards Srinagar. Around 4 Kms. of fast and thrilling rafting has beautiful land scenery. The rafting finishes at Nimoo the confluence of Zanskar and Indus rivers. Perhaps this stretch is one of the most popular stretch as it is not too harsh and good for beginners.

Nimmo to Alchi: This fourth grade rafting takes half day and only experienced people are advised to undertake it. As it has powerful waves and requires very precise maneuvering.