Before we get into the specifics of Kentucky bluegrass, let’s talk about the basics of cool-season grasses.
Turf-type grasses are classified as either cool-season or warm-season grasses based on how they grow and the climate(s) they prefer. Kentucky bluegrass is one of the most popular cool-season grasses.
Cool-season grasses have adapted to colder temperatures and grow across the northern United States and parts of the transition zone. They start growing in early to mid-spring when temperatures are above freezing (40 to 42°F) and grow until October or November when they go dormant to survive winter temps and being buried under snow.
They grow the most in the spring and late fall when soil and air temperatures are 65 to 75°F. They (typically) do well when temperatures are milder in July and August, but in extreme heat, they need more water to stay green. Some cool-season grasses go dormant when it gets too hot and perk back up when temperatures cool again.
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