This historical data set consists of 26 permanent 1‐m 2 quadrats located on sagebrush steppe in eastern Idaho, USA. During most growing seasons from 1923 to 1957, and again in 1973, all individual plants in each quadrat were identified and mapped. This combination of a long time‐series with full spatial resolution allows analyses of demographic processes and intra‐ and interspecific interactions among individual plants. The da...