Jeff, That picture was taken Nov 19. I had another bloom a week later and soon after that we had a few nights of zero degree +/- nights. The flower buds were fried.

For actual flowering time and length, Snow Flurry has been the best in my area. It starts late September and went as late as January one year. That year (2007) was the year we had no sub freezing temperatures to speak of until mid January when temperatures plummeted to near zero. The plant died that season since it had not hardened off. I have not run across another Snow Flurry in the area since then.