The data presented are from samples of snow gathered approx. every few days at three sites in central Idaho from 27 January to 24 March 2014. In most cases samples were gathered at intervals throughout the snowpack depth. In a few cases we only sampled newly-fallen surface snow. Samples were also collected from a site to the southeast of Vernal, Utah, mostly of surface snow only, 28 January – 21 February 2013 and 17 January – 17 February, 2014.