Answer: It's true that cool-region grasses like Kentucky blue and fine fescue grow vigorously in spring and fall, and go dormant during the heat of summer, but they don't stay green if they're dormant -- they turn brown, and turn green again when fall rains return. If the soil is healthy and spring brings plenty of rain, and you mow your lawn on the high side (2.5-3" tall), then you can reduce the amount of water you provide your lawn. If you don't want the grass to brown, I'm afraid you'll probably have to water (unless there's a naturally high water table on your property that provides plenty of moisture). If it's not practical for you to care for such a large expanse of turf, consider doing some landscaping, adding low-maintenance shrubs and flowerbeds to cut down on the amount of thirsty turf.
For more information on how to care for your lawn and keep it healthy, I suggest that you take a look at a book that National Gardening Association co-wrote: Lawn Care for Dummies: A reference for the rest of us (IDG Books). I refer to it all the time! Enjoy your new home!
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