Sandakphu is the highest peak in the Singalila Ridge and yet it is an easy trek which can be done all year round. However, there are basically two prime seasons to do this trek and picking one of the two seasons really depends on what you want from your experience.
1. October to December The sky remains very clear at this time and if you want a mesmerizing view of the mountain ranges under clear skies then this is the best time to go on the Sandakphu trek for you.
2. April to June This is the wonderful flowering season and the entire valley blooms with rhododendrons, orchids and other beautiful types of flora. If you want to witness a vibrant flowering season then this is the best time to go on the Sandakphu trek for you. I personally prefer this time over the other.