Cool season zone

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1. An area of North America, comprised of Canada and roughly the northern third of the continental United States, where climatic conditions support a specific group of turfgrass cultivars; cool season turfgrasses are adapted to maximum growth under temperatures of 60 to 75° F during the growing season.

transition.jpg

The cool season zone is above the transition zone in this example.
Source: Ohio State University Turfgrass Program