Growth rate of shrub-fruticose Cladonia lichens was estimated on reindeer pastures in forest-tundra and tundra zones of West Siberia. The main environmental factors that determine growth rate variation of Cladonia lichens on reindeer pastures were identified. Changes of lichen growth rate on northern West-Siberian pastures from 30–80th years of the XX century to 10th years of the XXI century were detected.