CLM simulation was conducted in offline mode for the period 2000-2010 at a spatial resolution of 0.9ºx1.25º in latitude and longitude, respectively. The simulation was driven by meteorological forcing obtained from NASA's Modern-Era Retrospective Analysis for Research and Applications (MERRA). CLM global estimates of snow cover fraction (SCF), snow depth and snow water equivalent (SWE) were evaluated using observations from: 1) the Moderate Resolution Imaging Spectroradiometer (MODIS) SCF, 2) the Interactive Multisensor Snow and Ice Mapping System (IMS) data, 3) the Canadian Meteorological Centre (CMC) daily snow depth Analysis data, 4) the snowpack telemetry (SNOTEL), 5) the Cooperative Station snow depth and water equivalent Observations (COOP). CLM SCF agrees well with MODIS and SCF observations as well as with IMS snow cover product, especially in January and February when snow cover extent is at its maximum. Generally, false alarms and misses occur in southern Russia, US Rocky Mountains, and in areas near the US-Canadian border, southwestern Russia, and on the Tibetan plateau. The results of the evaluation will have an implication on the choice of algorithm used in the data assimilation.