Answer: You are in what we call a transition zone as far as turfgrass types are concerned. This makes it difficult to have a green lawn all year around because grasses are typically either cool season or warm season grasses. To have a green lawn all year around you'll want to have a combination; bermuda grass for summer, overseeded in the fall with fescue or ryegrass for winter months. Tall fescues are the best pure blend for your area, but they remain green only 8-9 months of the year. If winter dieback isn't important to you, then I'd recommend seeding with tall fescue.
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