Kikuyu Grass! It's a tropical grass, but I am having a surprising amount of trouble finding cold-hardiness data about it. Will keep looking.

Okay. From the book Turfgrass Maintenance Reduction: Sports, Lawns, and Golf by Doug Brede. John Wiley and Sons, 2000:

"Its lack of cold tolerance is the only reason why kikuyu has not enveloped the entire world. Kikuyu rarely survives temperature below freezing. It is found mainly in areas where the temperatures remain above 60 deg. F (15 deg. C) (Hathaway, 1979)"

With that, it sounds pretty near impossible. The question is, why would you want to--where it does grow, it is perennially cursed as a weed!