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This study’s goal was to determine the prevalence, temporal trends, seasonal patterns, and temporal clustering of <i>Salmonella enterica</i> isolated from environmental samples from Ontario’s poultry breeding flocks between 2009 and 2018. Clusters of common serovars and those of human health concern were identified using a scan statistic. The period prevalence of <i>S. enterica</i> was 25.3% in broiler breeders, 6.4% in layer breeders, and 28.6% in turkey breeders. An overall decreasing trend in <i>S. enterica</i> prevalence was identified in broiler breeders (from 27.8% in 2009 to 22.1% in 2018) and layer breeders (from 15.4% to 4.9%), while an increasing trend was identified in turkey breeders (from 12.0% to 24.5%). The most common serovars varied by commodity. Among broiler breeders, <i>S. enterica</i> serovars Kentucky (42.4% of 682 submissions), Heidelberg (19.2%), and Typhimurium (5.4%) were the most common. <i>Salmonella enterica</i> serovars Thompson (20.0% of 195 submissions) and Infantis (16.4%) were most common among layer breeders, and <i>S. enterica</i> serovars Schwarzengrund (23.6% of 1368 submissions), Senftenberg (12.9%), and Heidelberg and Uganda (9.6% each) were most common among turkey breeders. <i>Salmonella enterica</i> ser. Enteritidis prevalence was highest in submissions from broiler breeders (3.7% of 682 broiler breeder submissions). Temporal clusters of <i>S. enterica</i> serovars were identified for all poultry commodities. Seasonal effects varied by commodity, with most peaks occurring in the fall. Our study provides information on the prevalence and temporality of <i>S. enterica</i> serovars within Ontario’s poultry breeder flocks that might guide prevention and control programs at the breeder level.