This dataset contains a data report which summarizes information that was collected as part of the NSF-sponsored Arctic Transitions in the Land-Atmospheric System (ATLAS) project called "Arctic Climate Change, Substrate, and Vegetation." The goal of the project is to predict the consequences of climate change in the Arctic by examining present-day transitions. A wide variety of vegetation properties were measured across the climate gradient in northern Alaska and the Seward Peninsula, in areas of different geology and soils. This work is part of the larger ATLAS project, which is examining the transitions in the flux of energy, water, and trace gases along these same gradients.