This paper investigates the determinants of the probability of consumption and consumption frequency of fresh and processed mushroom in the U.S by applying the zero-inflated ordered probit model (ZIOP). The ZIOP model allows us to account for the excessive zero observations in the survey data and differentiate between the genuine “non-consumers” and “potential-consumers”, who did not consume at current period but would become a consumer if the circumstances were different. The results indicate that the decision to participation to consume or not and the decision on how much to consume are driven by different factors.