Jason,
Karsten Creek here in Stillwater also has Zoysia grass fairways. Apparently the Zoysia band does cover a good portion of the upper part of the state. I think the fact that Karsten and Patriot are both high end limited play courses has something to do with that.
Over the last couple of years courses here have been migrating away from bentgrass greens to burmuda greens, due to the heat and lack of water.