Hemkund (Snow Lake) Sahib, as the name itself suggests, is a high-altitude lake (4329 m) surrounded by seven huge now-covered mountains, which are collectively called Hemkund Parvat. Close to the lake is a sacred Gurudwara that is a pilgrimage centre for Sikhs and Hindus from all over the world. The high altitude Lokpal lake, known as Hemkund ( 4329 mts.) lies in heavenly environs. A steep trek from Ghangharia leads one to this spot in about four to six hours.
It is said that Shri Guru Govind Singh Ji (the Tenth Guru of the Sikhs) meditated on the very banks of this lake where a number of sages and religious teachers from the Hindu mythology, including Rishi Medhasa of the Markandeya Purana and Lakshman, the brother of Lord Ram performed penance. Besides the Gurudwara, you can also see a temple here. The lake is the source of the Laxman Ganga (alternatively called Hem Ganga) stream that merges with the Pushpawati stream flowing from the Valley of Flowers, at Ghangaria. From this point on, the river is called Laxman Ganga. 
A very popular trekking destination, Hemkund is a 15 km trek from Govindghat. The trek takes one through pine forests where rhododendron (burans), wild roses, ferns and alpine flowers abound. With breathtaking views of the surging waters of the Lakshman Ganga, the last five kilometres of the trek entails a steep climb from Ghangharia, which is a base for visiting Hemkund.
The lake is about two kilometres in circumference. It has clear, still water mirror images of the Saptashringa peaks (5500 m) that surrounds it.So what's the best season to visit Hemkund? No doubts: it's between July and October. During these days, you'll find the water still, has shards of ice floating in it, glinting in the sun with the rock-strewn banks of the lake covered in moss and the flowers in bright bloom. 
The Sikh reference begins with a line in the autobiographical poem "Bichittar Natak" by the tenth Sikh Guru, Sh.Guru Gobind Singh ji. In it is described a place deep in the Himalayas with a glacial lake and surrounded by seven peaks where in a previous incarnation, He meditated and united with the Master.
After having been lost to people for centuries, in 1930, a Sikh soldier, Havildar Modan Singh of Bengal Sappers and Miners regiment, a part of the survey team, found Hemkund as he was trekking through this region, and connected it with the place from Sh.Guru Gobind Singh ji's writings, later with the help of another devotee, Sant Sohan Singh, of Tehri Garhwal, a retired granthi from the Indian Army he laid the foundation of present pilgrimage in 1937 and opened access to the public through Govind Ghat.Later he went on to stayed here, until his death in 1960 .The Sikh religious organizations eventually picked up on this find and designated Hemkund as a special place for worship.