Hey Harshit, Yes it remains open in winters. You can go to Kheerganga but it will be cold and snowy. If you are more of a winter lover then you can go.
Hi, there are no closing dates for this trek, you can do it round the year. The only time you won't be able to do this is when there is too much snow on the trail. You have to check before you are going about the amount of snowfall the place has received.