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Neonatal calf diarrhea is a syndrome of young calves aged less than 1 month old, provoked by the combination of infectious and non infectious causes. Cryptosporidium spp. as well as rotaviruses are the most commonly found causes in cases of diarrheic fecal samples. Colostrum management is the most important preventive measure, leading to adequate passive transfer to the newborn calves and thus, to the reduction of the neonatal diarrhea, including Cryptosporidium spp. The aim of this study was to assess the effect of colostrum quality and quantity on Cryptosporidium spp. diarrhea, during different seasons of the year, in an intensive dairy cattle farm, in Greece. Fecal samples were, randomly, collected from 100 calves, including all seasons of the year 2016. Screening for Cryptosporidium spp. oocysts was performed by staining fecal smears with Ziehl-Nielsen stain. At the time of collection, the consistency of each fecal sample was recorded according to the following manner: (1) normal feces, (2) soft feces and (3) watery feces. Colostrum quality was evaluated for each cow (with a calf included in the study) directly after the parturition, with the help of a colostrum meter. The total volume of the two colostrum meals, fed during the first 24 hours, was recorded using a graduated measuring cylinder. Both parametric and non-parametric statistical methods were applied for the statistical evaluation of the data. All analyses were conducted using the statistical software program SPSS. In total, 71% calves were positive for Cryptosporidium spp. oocysts. The statistical analysis revealed influence of colostrum quality on Cryptosporidium spp. oocysts shedding through feces. Linear regression showed that the colostrum quantity, during the first two meals post partum, was negatively associated with the number of Cryptosporidium spp. oocysts in feces. During multivariable analysis, the variables representing the quality of colostrum and the season of the calf’s birth were identified as confounders. The results of this study showed that the percentage of Cryptosporidium spp. infection was high among young dairy calves of the herd, leading to high risk of diarrhea. Colostrum management (colostrum quality and quantity) and season of the calf’s birth influenced the number of Cryprosporidium spp. oocysts. Our study proved that risk factors such as the colostrum quality and quantity, as well as the season, can affect the Cryptosporidium spp. shedding and the consistency of the feces. The above findings demonstrate novel risk factors that should be included in the strategic approaches to control cryptosporidiosis.