I really do not know how far north it does well. It makes good pasture and has decent yields for hay.
It is not as good as coastal for hay yields, but IMO its better pasture because it takes so little maintainence.
There are several varities of Bahia with again IMO as Paraquay as the best followed by Argentine and Pensacola. Its tough grass and invasive I figured if the good Lord made anything that tough with that much will to survive why fight it and embrace it. Have to be careful being to aggresive with grazon (use2-4-D) as it will kill the seed year after year usage will reduce the stand but it will on common bermuda as well. I like common bermuda for pastureas well. Bahia here will grow anywhere, it can take a while to get it up from seed if they are not scarfired.
You might look into Red River crab grass as I have a test plot planted, it has better yields than coastal or bahia here, reseeds and the cows love it. I am still in the learning stages on it.
Nothing is drought proof and a man has to look at cost as well.
The best grass in the world is the kind that grows best in your area with the least cost and the best yields for the least cost. Coastal is great but if you have to spend a small fortune to keep it clean and fertilized to produce as much as X grass with less fertilize and chemical cost, is where you have to decide if it is worth it.
I spent a small fortune trying to establish coastal here, total waste of money and land that was not producing.
I fell into that old fishing lure trap of fishing lures are not made to catch fish but fishermen.