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The objectives of this study were to determine the prevalence, temporal trends, seasonal patterns, and temporal clustering of <i>Salmonella enterica</i> isolated from fluff samples from poultry hatcheries in Ontario between 2009 and 2018. A scan statistic was used to identify clusters of common serovars and those of human health concern. A multi-level logistic regression model was used to identify factors (poultry commodity, year, season) associated with <i>S. enterica</i> presence. The period prevalence of <i>S. enterica</i> was 7.5% in broiler hatcheries, 1.6% in layer hatcheries, 7.6% in turkey hatcheries, 29.7% in waterfowl hatcheries, and 13.8% in game-bird hatcheries. An overall increasing trend in <i>S. enterica</i> prevalence was identified in waterfowl and game-bird hatcheries, while a decreasing trend was identified in broiler and turkey hatcheries. Overall, the most common <i>S. enterica</i> serovars were Kentucky, Enteritidis, Heidelberg, and Senftenberg. <i>Salmonella enterica</i> ser. Enteritidis was the most common serovar in waterfowl hatcheries. Temporal clusters were identified for all poultry commodities. Seasonal effects varied by commodity, with the highest odds of <i>S. enterica</i> occurring in the summer and fall. Our study offers information on the prevalence and temporality of <i>S. enterica</i> serovars that might guide prevention and control programs at the hatchery level.