Origins of Kentucky Bluegrass

Kentucky bluegrass is native to practically all of Europe, northern Asia and the mountains of Algeria and Morocco. Although the species is spread over all of the cool, humid parts of the U.S., it is not native to North America. Apparently the early colonists brought seed of Kentucky bluegrass to this country in mixtures with other grasses.

In the southern U.S., Kentucky bluegrass is limited to the transition zone from North Carolina, through much of Tennessee, northern Arkansas to the panhandle of Texas and Oklahoma. In the western states, Kentucky bluegrass is grown with irrigation.

http://aggie-horticulture.tamu.edu/plantanswers/turf/publications/bluegrass.html