Last winter did not see any snow at all across the entire Himalayan region. Even in areas like Ladakh and Spiti, it did now snow until mid January and that too just once. After January, Feb went dry completely and then it started to snow again in March. Passes like Rohtang too did not receive even half of the usual amount of snow that they do. This year however, the story is entirely different. Winter seems to have arrived early. A surprisingly heavy and early snowfall in the month of September saw roads getting blocked across Spiti valley and Ladakh. So heavy the snowfall was that tourists had to be airlifted out of Chandratal and Kaza - Manali stretch.
The trend is still continuing. It has been snowing in Manali all day yesterday and Rohtang Pass received quite a bit of snow. If the weather remained the same way, it is expected that it may even start to snow in Manali as well; which would again mean a very early snowfall in the town. Rohtang Pass as a result has been closed for all types of vehicles. Even motorcycles are not being allowed and it is highly unlikely that it will open again this year. For now, it is safe to assume that Rohtang Pass is officially closed for this season. Even if they open it for a few more days, I would advise against traveling.