This directory contains 2 files with tree-ring data collected as part of the US Forest Service Forest Inventory and Analysis (FIA) program in the Interior Western US. The samples (increment cores) were collected from Pinus edulis trees associated with FIA plots in two different inventory designs: periodic inventories before the year 1999, and after 1999, annual inventories, in which a temporally and spatially stratified ~10% of plots are sampled each year, such that each plot is visited every ~10 years (DeRose et al., 2017; USDA Forest Service, 2015, 1999). Data stored in this repository includes increment cores from 1558 trees, most of which were sampled during periodic inventories, from tally trees, site trees, or representative trees adjacent to FIA plots. Of these trees with increment cores, many were in plots carried over to the annual design, but others were orphaned after the implementation of the annual design in 1999.