· Michael Blair
Middle Tennessee is in the transition zone, the band where cool-season grasses struggle with the summer and warm-season grasses struggle with the winter. There is no grass that is simply correct here. The choice is which compromise fits your lot, and the deciding factor is usually shade.
What each one actually does here
Tall fescue stays green from roughly October to June, tolerates shade better than anything else that will grow here, and browns off in the July heat. It is a bunch grass, so it does not spread to fill damage and needs overseeding to stay thick.
Bermuda is green from roughly May to October, thrives in the heat that flattens fescue, and goes fully dormant and straw-coloured from first frost until spring. It spreads aggressively by runners, so it repairs itself, and it will not tolerate meaningful shade.
Shade decides it more than anything
Bermuda needs full sun, realistically seven hours or more. Anything less and it thins, opens up, and fills with weeds. Most Nashville lots have mature trees somewhere, and a bermuda lawn under a canopy is a losing project regardless of maintenance.
Fescue manages in four to six hours. That is why it remains the default here despite being the grass that suffers most in summer — it is the one that will actually grow across a typical Middle Tennessee lot.
The maintenance is genuinely different
Fescue needs overseeding every autumn, because it does not spread and thins each summer. That is an annual cost. In exchange it asks very little in the growing season beyond mowing and two feeds.
Bermuda needs no overseeding and repairs itself, but it wants frequent mowing at a low height through summer, more nitrogen than fescue, and edging discipline because runners invade beds and neighbouring lawns.
Living with the dormancy either way
The honest question is which brown season you mind less. Fescue is brown for six to eight weeks in high summer, when you are outside. Bermuda is brown for five months in winter, when you mostly are not.
Some Nashville homeowners run bermuda and overseed it with annual ryegrass for winter colour. It works, it is more maintenance than either grass alone, and it delays bermuda green-up in spring because the ryegrass competes.