An ecological classification system was developed for the mid-boreal ecoregions of Saskatchewan through the analysis of vegetation, soil, site, and forest productivity information. The hierarchical classification system has three levels—ecosite, ecosite phase, and plant community type. Thirteen ecosites are described with further detail provided by subdivision into ecosite phase and plant community type. A soil type classification system that describes 17 soil types was also developed. Management interpretations were made for drought, excess moisture, soil rutting hazard, compaction hazard, puddling hazard, soil erosion hazard, frost heave hazard, soil temperature limitations, vegetation competition, windthrow hazard, productivity, and season of harvest. Color photos and drawings for 103 common plants of the mid-boreal ecoregions of Saskatchewan are presented.