Grade A : Easy to Medium
Easy trekking by Himalayan standards is usually up to 2000m. There are many ups and downs on well-maintained trails. this sort of trip is best fitted to those that lead a fairly active life. The trek takes about 3 to 7 days, walking about 4 to five hours each day.
Grade B : Medium to Hard
This involves longer treks (five to 10 days) on maintained trails. This sort of trek includes day excursions to higher elevations, that it's advisable to possess some previous hill-walking experience. On these treks, we generally achieve an altitude between 900m to 3000m.
Grade C : Moderate To Strenuous
These treks must be fully supported. We climb to altitudes between 3500 and 5000m, there are overnight stays at altitudes above 4000m. For this trek, trekkers should be fit and enthusiastic hill walkers prepared to tackle difficult terrain in remote areas..
Grade D : Very Strenuous
This trek is best described as Alpine, and suitable is suitable for those in excellent health, capable of carrying a backpack, when required. The trek covers very remote areas, traveling over snow-covered passes at an altitudes of up to 6500m. you'll got to axes and crampons. No strenuous trek should be undertaken without medical clearance.