I really have no idea – I suspect somebody will have a better sense of this in the next decade or so. Just poking around, I’m not really sure where the most recent generation were bred and tested – my understanding from the other thread on Dar Sofiyivki (Hybrid persimmon Dar Sofiyivky - #39 by jcguarneri) that much of the work was done around Kherson, which at first glance seems similar to somewhere like central Indiana. However, there seems to be some confusion about how much further north it’s been growing. If I remember correctly, @Harbin is in Brno, CZ and has shown some pretty impressive harvests.