Uttaranchal lies on the south slope of the mighty Himalaya range, and the climate and vegetation vary greatly with elevation, from glaciers at the highest elevations to tropical forests at the lower elevations. The highest elevations are covered by ice and bare rock. The Western Himalayan Alpine Shrub and Meadows ecoregion lies between 3000-3500 and 5000 meters elevation; tundra and alpine meadows cover the highest elevations, transitioning to Rhododendron-dominated shrublands below.

The Western Himalayan subalpine conifer forests lie just below the tree line; at 3000-2600 meters elevation they transition to the Western Himalayan broadleaf forests, which lie in a belt from 2,600 to 1,500 meters elevation. Below 1500 meters elevation lies western end of the drier Terai-Duar savanna and grasslands belt, and the Upper Gangetic Plains moist deciduous forests. This belt is locally known as Bhabhar.These lowland forests have mostly been cleared for agriculture, but a few pockets remain.

Indian National Parks in Uttaranchal include the Jim Corbett National Park at Ramnagar in Nainital District, Valley of Flowers National Park and Nanda Devi National Park in Chamoli District, Rajaji National Park in Haridwar District, and Govind Pashu Vihar National Park and Gangotri National Park in Uttarkashi District.