Adam,
In the fall, you can have the best of both worlds, at least up here in my part of the woods. The courses tend to green up after the heat stress of summer without the need of alot of water. On top of that they play much more firm. I played a round up in the UP at Greywalls this weekend and the course was really lush, but firm from tee to green, making those DeVries greens come alive in ways I hadn't yet seen in my limited play up there. Green doesn't always mean mush, although you can travel down I80 and see that for yourself at Wild Horse.
Cheers,
Brad