From winters 2016-2017 through 2018-2019, over half of the WFOs in the National Weather Service participated in the probabilistic snowfall experiment. As part of the experiment, observed snowfall and probabilistic forecasts were saved from both the WFO and WPC. This robust data set was then verified to determine the reliability of the probabilistic forecasts. A comparison of the WFO and WPC probability forecasts is done to determine if the addition of the WFO snowfall forecast added value to the probabilities originally derived from WPC. Our results show that the range between the 10th (5th) and 90th (95th) is smaller for the WFO than for WPC. As a result, lower percentage of observed snowfall events are within the middle 80th (90th) percentile for the WFO compared to WPC. We also found that the 5th and 10th percentile accumulations were too high for snowfall events greater than 6 in. while the 90th and 95th percentile snowfall were too low for low (< 6 in. events). Brier Scores will be computed for different forecast hours and snowfall thresholds – such as probability of exceeding 6 in. – to illustrate how skill varies with forecast hour and by forecast snowfall amount. Overall, probabilistic forecasts are found to provide reliable information for IDSS.